Missing hand

I've had CC with portions of clothes that failed to match with the parts of the body properly to the degree that made that part invisible. It's a thing with a lot of games, involving both CC and badly made base game items.

Odd thing being that it could be something not even involving his hand, so don't dismiss anything if you go through your cc piecemeal.

If you don't have CC, then a game repair might be in order, as it could be a hiccup in code.