Well I’m not Blender team, but if you attached your .blend I could take a look. RIght now I have too many questions. Is this in rest mode. Are there any shape keys. Was it always like that or after you applied the armature modifier, or what. etc etc etc
but it’s not a full file, I just delete the back body as this file belongs to the client so can’t share the full mesh, sorry about that. but you can get the idea from legs.
let me know if that works.
Thank so much.
Just tried the apply pose as rest pose thing - doesn’t quite solve it because the rest pose ends up being different.
I think the problem may be bigger, maybe you need to re-generate the whole rig. You seem to be using IK, but it doesn’t work right (moving IK platforms deform legs in a weird way). I honestly suggest fixing the skeleton first, and re-generating.
Try completely unparenting every tweak bone (the small spheres) in Edit mode. I did that and it “fixes” the problem (the weird rotations on the mesh disappear), but now of course your tweak bones probably won’t work properly. If you delete them completely and re-skin the mesh to the rig, it should work, but obviously now without tweak bones.