Alduin alive after Sovngarde quest

[Rakshasa]

So I've completed the Sovngarde quest a long time ago but now on my way to high hrothgar I spotted a 2 dragons flying on the throat of the world. Didn't care since some Paarthurnax allies roam there but as I looked closely I spotted a different dragon, looked like Alduin even from a distance. I went there just out of curiosity not really confident but as I reached the throat of the world it looked even more like him. I tried to fast travel just to somewhere else as I was sure that couldnt happen but it said enemies were nearby. He was a little bit far from the peak so I clipped myself to him. As I approached he became hostile and as any dragon started following me. I went back to the throat of the world and both Paathurnax and a random dragon sitting there fought against him as well. Problem is this Alduin is essential and once his health bar goes down he just stares at me with some glowy blue lights on his skin. Also it rains meteors like in the quest where you fight him for the first time before going to Sovngarde. I tried using the console to set him as non-essential but this is a different Alduin. The BaseID in his wiki doesnt match this version of Alduin and by pressing mouse click to see his ID it's also different, 0004377e.
This is a first for me as I've never experienced this (bug?) before...

[Perplex]

Mods?

[Rakshasa]

My only mods are to change skyrim big cities, new armors and weapons, civil war, better textures, details, reflexes, etc. None of them have anything to do with dragons, the only ones that do something about story lines are the civil war mods I mentioned but I've played with this before and this Alduin thing never happened

[tulle040657]

When you click on something while the console is open you get the refid not the baseid, 0004377e is the correct refid for Alduin

[Altbert]

0004377E is the reference ID of Alduin (in the past) as he appears fighting Gormlaith, Hakon and Felldir, while the player is reading the Elder Scroll at the time wound. His base ID (in the past) is 0004377F. This is very peculiar! If a mod would make Alduin appear at the Throat of the World his reference ID would have started with one or two non-zero digits (e.g. 0E or 1A), but his base ID would still be 0004377F. Maybe discovered an unknown bug?