i have this prob with atomic mucle

[Luciferx42]

i dont know why game do this please help me 

[DragAndPlace]

That is most likely a rigging issue. Do you have the ZeX skeleton and made sure nothing was replacing it?

[Luciferx42]

I installed everything properly, without overlooking anything; everything works perfectly except for that.

[Luciferx42]

[DragAndPlace]

It looks like something is overriding resources your ZeX skeleton mod. Can you check for conflicts on the 'Data' tab on your right? Look into Meshes/Actor/Character/CharacterAssets/skeleton.nif and see if the mod it comes from appears in red.

Another tiny thing I saw on your modlist is that you use OCBPC along with OCBP LPCE. Unless you have a clear reason to have them both (like a specific file), you can safely disable OCBPC as the other mod completely replaces its behaviour. I don't think that stretching is a physics thing, but who knows?