Can someone tell me why I have 2 right forearms? I only have 1 left forearm...

>make a pose
>export
>import on an actor to test
>the right arm is all fucked up
>wtf
>discovered there was a second "forearm right" bone that was just floating off to the side
>so when I imported a pose, it used the floating "forearm right" bone as the "correct" one which made the arm bend and twist in order to make it there and back to where the hand was

what gives? did I accidentally add this bone? I don't know how to get rid of it and idk which one is the real one!