Issue with Scoundrel's Folly quest...

[Racktoar]

I'm currently doing the "Scoundrel's Folly" quest for the Thieves Guild. I am supposed to confront Gulum-Ei, but half-way through the grotto, you meet Gulum-Ei running back to the Warehouse, when you follow him into it, the guards wil lnotice you, so you'll have to kill them, and then Gulum-Ei runs up to you and say you're trespassing.
You can activate him and you'll start the confrontation dialog, but I'm unsure if I wanna finish the quest like this. I want it to work properly...
This happened to my last character as well, and I've got a lot of mods installed, so it might be a conflict somewhere, but I'm not gonna start removing mods to test my way forward, because I neither have the time, or the motivation to start such a tedious days consuming task....
What I'm looking for is if anyone knows of any mods or that affect the thieves guild, or Gulum-Ei, that can confilct with this. Or maybe a mod that isn't what you'd first think of that could affect it.

Any idea of what could cause this?

Here's a load order list:
0 0 Skyrim.esm
1 1 Update.esm
2 2 Dawnguard.esm
3 3 HearthFires.esm
4 4 Dragonborn.esm
5 5 Unofficial Skyrim Legendary Edition Patch.esp
6 6 Falskaar.esm
7 7 Wyrmstooth.esp
8 8 Dragon Break.esm
9 9 ApachiiHair.esm
10 a JSwords.esm
11 b 0db2SECOND.esm
12 c Campfire.esm
13 d ClimatesOfTamriel.esm
14 e CompanionArissa.esm
15 f ZaZAnimationPack.esm
16 10 SexLab.esm
17 11 SexLabAroused.esm
18 12 actorEvents.esm
19 13 HentaiPregnancy.esm
20 14 SexLabSoulgemPregnancy.esm
21 15 PSQ PlayerSuccubusQuest.esm
22 16 CreatureFramework.esm
23 17 HighResTexturePack01.esp
24 18 HighResTexturePack02.esp
25 19 HighResTexturePack03.esp
26 1a Unofficial High Resolution Patch.esp
27 1b SkyUI.esp
28 1c FNIS.esp
29 1d Alternate Start - Live Another Life.esp
30 1e RaceMenu.esp
31 1f RaceMenuPlugin.esp
32 20 RealisticNeedsandDiseases.esp
33 21 FalskaarRNDPatch.esp
34 22 ClimatesOfTamriel-Nights-Level-1.esp
35 23 ClimatesOfTamriel-Dawnguard-Patch.esp
36 24 ClimatesOfTamriel-Dragonborn-Patch.esp
37 25 ClimatesOfTamriel Falskaar.esp
38 26 CoT_SnowPatch.esp
39 27 dr_bandolier.esp
40 28 dr_bandolierdg.esp
41 29 convenient horses.esp
42 2a contrastboost.esp
43 2b invinciblehawkfix.esp
44 2c killarrows.esp
45 2d claw.esp
46 2e Wintermyst - Enchantments of Skyrim.esp
47 2f mintylightningmod.esp
48 30 mintylightningmod_cot_patch.esp
49 31 Immersive Citizens - AI Overhaul.esp
50 32 3DNPC.esp
51 33 3DNPC Alternative Locations.esp
52 34 3DNPC - Winterhold Mods Patch.esp
53 35 smeltdown_ingots_osr.esp
54 36 real wildlife skyrim 0.1.esp
55 37 RND_RWS-Patch.esp
56 38 aaareindeer beast race followers.esp
57 39 sos - the wilds.esp
58 3a sos - the dungeons.esp
59 3b SoS - The Wilds-PatchCoT.esp
60 3c betterinns.esp
61 3d OBIS.esp
62 3e OBISDB.esp
63 3f marriagemod - alpha v3.esp
64 40 Further Dark Dungeons for ENB.esp
65 41 ClimatesOfTamriel-Dungeons-Hazardous.esp
66 42 10 extra effect.esp
67 43 noldorarmor.esp
68 44 dcr_blade_set_reloaded_v1_0.esp
69 45 TradeRoutes.esp
70 46 TradeRoutes-RNaD-Patch.esp
71 47 Better Vampires ML.esp
72 48 ♥♥♥♥♥♥♥s of Skyrim - Light.esp
73 49 Frostfall.esp
74 4a abbm_dyramisty_01.esp
75 4b akmm_dyramisty_01.esp
76 4c adam_dyramisty_01.esp
77 4d athm_dyramisty_01.esp
78 4e atcm_dyramisty_01.esp
79 4f tb_dyramisty_01.esp
80 50 WATER DG + DB.esp
81 51 WATER Falskaar.esp
82 52 WATER Plants.esp
83 53 WATER-RND Legendary Patch.esp
84 54 Water-RND Falskaar Patch.esp
85 55 Purewaters.esp
86 56 RND_PureWaters-Patch.esp
87 57 bettermorthal.esp
88 58 IC-HearthfireEmittanceEnhancement_White.esp
89 59 TradeBarter.esp
90 5a imp_helm_legend.esp
91 5b dk_armor_by_hothtrooper44.esp
92 5c samuraiarmor.esp
93 5d valiantnordbow.esp
94 5e witchplate.esp
95 5f dragonboneebonsteel.esp
96 60 azarhair.esp
97 61 Akavari Katana Re_borne.esp
98 62 calyps-animal-ears.esp
99 63 CalienteVanillaArmorTweaks.esp
100 64 SexLabMatchMaker.esp
101 65 Wolf'sRecipies.esp
102 66 Craftable Staffs.esp
103 67 Craftable_DPMasks.esp
104 68 Draconic Bloodline.esp
105 69 EquipDragonTails.esp
106 6a Hentai_mixed_Armor.esp
107 6b dD - Realistic Ragdoll Force - Realistic.esp
108 6c SkyrimConfigMenu.esp
109 6d Insanity's Sorrow.esp
110 6e FollowerCompatibility.esp
111 6f GreenWaterFix_v2withDawnguard.esp
112 70 HarvestOverhaulSalmonRoe.esp
113 71 HarvestOverhaulDawnguardDragonborn.esp
114 72 Legendary Artifacts.esp
115 73 Lore Weapon Expansion - Goldbrand.esp
116 74 sandboxcylinderheight.esp
117 75 Unique Uniques.esp
118 76 Red Bane Redone V1.esp
119 77 Skyrim Knights.esp
120 78 SkyTweak.esp
121 79 TERAArmors_CBBE.esp
122 7a YourMarketStall.esp
123 7b TakeNotes.esp
124 7c Better Dynamic Snow.esp
125 7d Moss Rocks - Legendary.esp
126 7e XPMSE.esp
127 7f PSQ RND.esp
128 80 Immersive Arousal.esp
129 81 MoreNastyCritters.esp
130 82 SexLabNudeCreatures.esp
131 83 SexLabNudeCreaturesDB.esp
132 84 SexLabNudeCreaturesDG.esp
133 85 HentaiCreatures.esp
134 86 arrowsmith-dawnguard.esp
135 87 analtmerintrigue.esp
136 88 Cloaks.esp
137 89 Cloaks - Dawnguard.esp
138 8a 1nivWICCloaks.esp
139 8b 1nivWICSkyCloaksPatch.esp
140 8c JaxonzRenamer.esp
141 8d JaxonzEnhGrab.esp
142 8e UFO - Ultimate Follower Overhaul.esp
143 8f UFO - Dragonborn AddOn.esp
144 90 SummonValeDeer.esp
145 91 stormtail.esp
146 92 SexLab Beastess.esp
147 93 breezehomelightfix.esp
148 94 dragonscalespecies.esp
149 95 JSwordsDistributionBalancePlugin.esp
150 96 enhancedlightingforrealisticlighting.esp
151 97 ShiverFrostCottage.esp
152 98 PATCHDragon Break.esp
153 99 konahrik_accoutrements.esp
154 9a konahrik_accoutrements_db.esp
155 9b konahrik_accoutrements_dpe.esp
156 9c konahriks privilege by edhelsereg.esp
157 9d ICH - Konahriks Accoutrements Patch.esp
158 9e RayeksEnd.esp
159 9f Provincial Courier Service.esp
160 a0 MidasSkyrim.esp
161 a1 Drinking Fountains of Skyrim.esp
162 a2 RND_DrinkingFountains-Patch.esp
163 a3 tavevillages.esp
164 a4 tavefalkreath.esp
165 a5 bound weapons redux.esp
166 a6 riverwoodenhancedplugin.esp
167 a7 betterwinterhold.esp
168 a8 JBS_banking_redux.esp
169 a9 officialz'dar.esp
170 aa 0db2patch.esp
171 ab MilkModNEW.esp
172 ac MilkMod_MilkPumpsFancy.esp
173 ad MilkModNEW HF.esp
174 ae MilkModNEW CF.esp
175 af MilkModNEW ZaZ.esp
176 b0 hallsofdovahndor.esp
177 b1 thiefsarmor.esp
178 b2 Sweet&Sexy Lingerie.esp
179 b3 magic of the magna-ge.esp
180 b4 Sneak Tools.esp
181 b5 Sneak Tools Vanilla Masks.esp
182 b6 Sneak Tools Vanilla Hoods.esp
183 b7 t3nd0s masks.esp
184 b8 Kitiara.esp
185 b9 Argonian Access.esp
186 ba artifacts of sithis.esp
187 bb SummonsLion.esp
188 bc Dialog-Priority.esp
189 bd ArtOfTheCatch.esp
190 be Armour mods.esp
191 bf Spriggan Armor 2.esp
192 c0 uniquebows.esp
193 c1 isilnarsil.esp
194 c2 shadowravens.esp
195 c3 Equipping Overhaul.esp
196 c4 Beastess Vampire.esp
197 c5 AAAZZDarkwaterCrossingDungeon.esp
198 c6 wrath of nature.esp
199 c7 xaxas.esp
200 c8 My Home Is Your Home.esp
201 c9 godlyarmor.esp
202 ca lunareclips.esp
203 cb aremis_by_crazyasscc.esp
204 cc kisisa.esp
205 cd bosmerarmormaty743part1.esp
206 ce bosmerarmormaty743part2.esp
207 cf bosmerarmormaty743part3.esp
208 d0 bosmerarmormaty743part4.esp
209 d1 CraftablePantysCBBEv3M.esp
210 d2 FNISspells.esp
211 d3 KatriaGhostFollower.esp
212 d4 TrissArmorRetextured.esp
213 d5 WestWindAssault.esp
214 d6 Mighty Beasts - Werewolf.esp
215 d7 SexLabWerewolves.esp
216 d8 EstrusChaurus.esp
217 d9 zzEstrus.esp
218 da SWT1.2.esp
219 db Milker Movil Armor.esp
220 dc SoulGemPreg RND.esp
221 dd RaceMenuMorphsCBBE.esp
222 de Campfire - More powerful backpack amulets.esp
223 df CL EbonyWeaponsStandalone.esp
224 e0 Dual Sheath Redux.esp
225 e1 Illustrious HDT Cloaks.esp
226 e2 SeeYouSleepByMadmole.esp
227 e3 planters.esp
228 e4 ClavicusArgonianMasque.esp
229 e5 Circlets with hoods - Vanilla.esp
230 e6 CMO - Complete Male Overhaul.esp
231 e7 ApachiiHair - Extra.esp
232 e8 Rayya - Lighter skin and Cool hair.esp
233 e9 fallensword.esp
234 ea JSwords_Load_Screens.esp
235 eb RevampedExteriorFog.esp
236 ec supreme storms.esp
237 ed realraincot.esp
238 ee ENB Snow FX.esp
239 ef Skyrim Particle Patch for ENB - Flame Atronach Fix.esp
240 f0 Smoking Torches.esp
241 f1 Spells Cast Light.esp
242 f2 Butter.esp
243 f3 The Dungeon.esp
244 f4 BrighterTorchesBiggerMagelight.esp
245 f5 General Sam Final.esp
246 f6 Modern Brawl Bug Fix.esp
247 f7 Dual Sheath Redux Patch.esp

EDIT: Now after I eventually reached the end of the grotto, and looted the room where you're supposed to talk with Gulum-Ei, he appeared there, so I leave the grotto with all npcs where they should be, but, I'm sitll not happy, I don't want this to affect future characters, so I still want help.

[Eternie]

Were you sneaking as you followed Gulum-Ei to the warehouse?
Did you give him a head start so that he doesn't notice you? If he runs to warehouse it's because you got too close and he spotted you.

Did you actually try to avoid the guards using sneak, muffle and invisibility allows you to do it all without killing anyone, apart from the guard right next to him.

[Uncle64]

You should sort you load whit LOOT.
You also have some old mods that you should consider to upgrade.
MNC is one of them.

As Eternie says, you need to make sure that the guards dont see you.

[Racktoar]

Originally posted by Eternie:

Were you sneaking as you followed Gulum-Ei to the warehouse?
Did you give him a head start so that he doesn't notice you? If he runs to warehouse it's because you got too close and he spotted you.

Did you actually try to avoid the guards using sneak, muffle and invisibility allows you to do it all without killing anyone, apart from the guard right next to him.

Yes, I know what to do, I have done it many times before in earlier playthroughs.
He did NOT spot me.

[Racktoar]

Originally posted by Uncle64SwE:

You should sort you load whit LOOT.
You also have some old mods that you should consider to upgrade.
MNC is one of them.

As Eternie says, you need to make sure that the guards dont see you.

LOOT says it doesn't need to do anything, when I modded my game was was careful a put the mods in the right places.

What mod is MNC?

[Uncle64]

More Nasty Critters. You are using one old and obsolete version that contains old files you should not use.
I hope you dont use CreatureFramework from it, that is also old and obsolete.

Also curious how could LOOT say that it did not need to sort your load?
Your load have several of errors that it should detect.

This one is terrible old to, and there is newer and way better. And you dont need any esp at all.
230 e6 CMO - Complete Male Overhaul.esp

[Uncle64]

Skyrim it self is one odd game, all sorts of errors can happen when your load is incorrect, since many mods do change more stuff then can think about.

Adding.
Since Gulum-Ei is one 2 legged cat, he is in the control of Creaturepack.
You should consider later to find the guide how to install those types of mods that are made by MadMansGun.

[Racktoar]

Originally posted by Uncle64SwE:

More Nasty Critters. You are using one old and obsolete version that contains old files you should not use.
I hope you dont use CreatureFramework from it, that is also old and obsolete.

Also curious how could LOOT say that it did not need to sort your load?
Your load have several of errors that it should detect.

This one is terrible old to, and there is newer and way better. And you dont need any esp at all.
230 e6 CMO - Complete Male Overhaul.esp

Can you give examples of the supposed errors that should appear.

And, I'll see what I can do about MNC, been a LONG time since I modded and played, and I'm too busy and tired to do a clean install of everything, specially now that I've reinstalled NMM to the same drive as I have all the Beth games on, had a bit of access error problems with it.

Whenever I get to reinstalling and updating mods I'll make sure to use Mod Organizer instead, much better and easier...

But, anyhow. Whether MNC is old or not (how do you know it's outdated?), it shouldn't affect the quest and those particular NPCs.

[Uncle64]

Check my updated post.

And that quest is little tricky to do, have got my self trapped by the guards to.

[Uncle64]

This is one good replacer for your male body mod.
https://www.nexusmods.com/skyrim/mods/82948 Vitruvia - Skin texture overhaul for males
You will save your self one slot. I think it is safe to change them.

[Racktoar]

Well, dogshite....
Oh well, guess I'll have to reinstall everythingat some point and remove pointless mods. Installing with MO will make me able to have different instances of Skyrim, sort of like a Minecraft modpack, no?

Then I'll have different mods and smaller modlists...
So many mods that I want to use and play but can''t due to constant crashing a breaking save files. But, that won't happen anytime soon, that's for the info :)

[Racktoar]

I decided to buy SSE as well, where I'll install mods, but nothing major or prone to save breaking.
We'll see when I get around to modding it.

[Uncle64]

Dont think you need to do that many changes. How far have you come in the playtrou?
You do have most of the base.

[Racktoar]

My character is lvl 32.
I have completed a large amount of side quests, I'm sure.
Thing is, changing stuff will probably break it even more...

It think the main problem is that I have WAY too many mods in the same instance, so it's better if I split it up with MO.

[Racktoar]

A lot of the SexLab mods are installed manually too, meaning uninstalling them will be a pain.

[Uncle64]

Yea. You are right.