I remade the entire body, looks like my mesh was messed up for some reason…
edit***
Thanks guys i already do all those things and also another ones solutions, none worked but i’ve learned alot with this bug, next time i will probably use rigify or blenrig it’s amazing and easy
Probably down to weight painting, basically the auto weights not doing a good guess at the weights. That may be something odd about your original mesh, perhaps double geometry.
Did you have “Double geometry” or “Inside normals”?
Yes, while these problems are really annoying and mostly due to user errors.
It’s also very helpful in learning Blender. Repetition is the key. You’ll remember the process much better.
I’m glad you can continue from this point.
Good luck with the rest of the course!