heyas; if you have arm ik turned on, then turn it off, the hands will twist off like that. after you turn the ik off, go to the hand and reset the twist, and probably the side-side/bend dials, too. remember to twist the forearm, NOT the hand. you might also try turning limits on as you start posing, then turn them off if/when you need to move the body parts faster than their recommended limit. (at least, this helps me.)