Problem with the bone tool

Hi, I'm having trouble with the Flash CS5 Bone Tool, Everytime I create 2 sets of objects whether its legs or arms, when I duplicate them. break them apart and make a second set of arms and legs, the two characters I assign them to, swap around when I saved them. So one has arms instead of legs and legs instead of arms, but the other character is completely unaffected. I move the bones within the symbols and they return to normal but then it affects the other character and vice versa.  Any help would be much appreciated. Thanks!