The Skelatal Mesh for the male Predator F left arm: Plm_F_Arms_Left_M is a right arm. Thus when selecting the male Predator F left arm, you end up with no left arm and 2 right arms.

There are also a few misprints in XComGame.int. Both right and left arms of Predator C Mark 2 and Predator F Mark 2 have some form misprint with X2BodyPartTemplate (for example: XMX2BodyPartTemplate). Thus the proper names don't show up in the game.

Many of the W.A.R. suit arms for the male soldiers are unlabeled.