Pretty much what the title says. It gets really obvious when you try to hold a map, and you can actually see the holes in their arms where their "hands" should be. I'm guessing this is probably an issue because the hands on their skins are not symetrical? Anyway, my suggestion is a fix for these skins, because it's rather annoying!
Yuna and Yamato skins in pack 3 have no hands (arms are too short) in first person view.