Duplicate Items, I think I found the Reason

[Ser Oddly]

So, some people like me, have had issues where
1. Key items are duplicated, like the manse kitchen key
2. All throwables and ammo are duplicated
3. All gestures are duplicated
4. All magic is duplicated
5. All tincts are duplicated

So, this happened to me sometimes, and other times it didn't and I think I've figured it out.

Reason :
If you play multiplayer, ie co-op or invasion during your playthrough, it resets the logic that would make those duplicate items become some form of consumable.

Tested :
Played through until Skyrest, joined multiplayer with my brother, helped him with 1 boss, returned to find key items and gestures and magic starting to duplicate.
Tested with the defense aura in the bridge backroom + tinct on the way to save the tortured prisoner

If you start fresh, all duplication stops, works normally until you start multiplayer again,
which then sort of messes with the system i think.
Being invaded or having someone join your world doesn't mess with the duplicating problem, you are safe.

Maybe the Devs can fix this by implementing something like the catalyst for saving tortured prisoner.
If you have one in your inventory, you pick the item but nothing gets added. This could be implemented to prevent duplicates.
or just let us use the option for "discard" or "sell"
It works for items that can't be dropped, like Ebb sword or Kukajin sword, Damarose Cleaver etc.
I get that "drop" can be bad, but discard is... we really need that right now.

[Rodi]

Originally posted by Ragnarok, World Destruction:

If you have one in your inventory, you pick the item but nothing gets added. This could be implemented to prevent duplicates.
or just let us use the option for "discard" or "sell"

Yes I hope they fix that or at least let us discard duplicate stuff.

[Ashandaar]

I didn't use it but i experienced something similar's on yesterday evening. I joined someone to help him killing a boss and when i came back to my game, i noticed every loot tied to a boss remembrance were again available, even those i already bought.