R_R_R_L_

Morning all!
I’m using harmony, i was doing a leg for my character, upper leg lower lef foot and so one.
I’ve finished and i’ve copy the whole per and drawing for the leg, pasted special and added a prefix R_ (R- is for right) and i’ve added a prefix as well to the original leg structure “L_”
To apply a prefix i’ve used the standard script available in the network view tool bar, the icon with ABC+.
It works.
BUT, i’ve discovered today that without any reason part o f the element are called now for example “R_R_R_R_R_R_L_L_L_L_UpperLeg”, instead just “L_upperLeg”, where it comes from all those extra “R_”? how can i fix that without rename all of ther?
Thanks