Armature Mesh Deformation Ever since I symmetrized the mesh so that it was perfectly symmetrical, the armature started deforming whenever I rotated it.



This was a completely new armature I made from scratch, I can't tell if it's the armature or the mesh that's making this awful deformation.  What is happening?  I put the automatic weights setting.

Also, when I rotated the armature on its own, it stretches the bones.  When I rotate just one bone it stretches only the tips of the fingers, and then mirrors the effect on the opposite side.  How to fix this?
Going by the image alone,  it seems like the nails might be the problem. I have seen figures with separate nail meshes and that causes problems with AW.

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One bit of unrelated advice, if this model is to be used in Blender, renaming your bones and adding .L and .R (left and right) at the end will greatly speed up your work. "Forearm.R" reads a lot faster than "Bone 50" and allows you acess to built-in functions like Paste Mirrored Pose

Edit

The next item on your checklist is to go into Weight Paint Mode and check if the messed up parts are (somehow) assigned to another bone.