Scalability settings set to low causes the mesh of my character to deform

Development Character & Animation
,
1

As title, medium or higher everything works fine, in low all the animations are broken like wrong weights or when you use an animation that doesn’t match the skeleton.

Please help.

2

It seems to happen only in a modular character (multiple meshes), but I can’t figure why

3

I guess my mesh is f**d up, I can share the fbx if somone wants to check, thanks.