Just an observation here. Has anyone else noticed how in wireframe mode you can rotate a model, say a left hand, and suddenly it flips or inverts or something and now it’s a right hand? Interesting
You probably have a Mirror Modifier on the mesh, so when it crosses X 0.00 it flips.
I think I’ve seen the dramatic flipping before with me, sometimes it vibrates back and forth like crazy, if this sounds like your problem then try canceling the rotation and try again.
This would not be possible with a hand- ever seen a hand with two thumbs?