So I was working on a character model, rigged it, and it worked fine. But I noticed that I had the hands backwards and tried to flip it. Now, it's not deforming properly.
The mesh didn't have any weight-painting before or after I flipped the hand, so I don't think that was the issue. Also, the character model is made up of several different meshes, not just one. I'm trying to make a drawing mannequin.