The position of that bone is determined by the orientation of it's parents. if you want the hand back where it was at the earlier frame you need to duplicate the keys on the arm bones or use IK
Hello animators! Wanna ask a little of your help on some issue i got with character animation. The thing is i'm trying to copy a keyframe that contains character's limb's both move and rotation information on a timeline, but freshly duplicated frame only contains rotation information, limb isn't moving! Meanwile if i move…