FNIS,T-posing and immersive creatures SSE

[Hizue]

Hi guys, I already checked the others topics and it didn't help me so I decided to post here because it's frustrating to fight t-posing creatures. It's unconsistent, only a little few of them are t-posing but still, I don't understand why. Oh and Fnis can't find the immersive creatures, and I got this line in Loot :
https://steamcommunity.com/sharedfiles/filedetails/?id=1853059606

I use Vortex and, again, Loot, and I don't have any other creatures related mod.
Am I dumb or ?
Thankf for the eventual help !