Timeline:
For the longest time , Forge had both a robot right hand and right leg
Then when he came back in Cable and XForce , after presumably being killed in Astonishing Xmen, he had his right hand back , presumably he did it to himself when he created mutates to battle the alternate reality invaders
Then in ExtraOrdinary Xmen and I vs. X , he apparently got the robot hand back , maybe because of the T-Mists? (No-Prize for art errors)
Then in Secret Empire , his whole right arm was now robotic , maybe due to the battles against Hydra or something?
But now in Xmen Red , both his hands are clearly organic.
So I’m thinking that since Cassandra Nova is the Revenant Queen after all, maybe she did the same thing with Forge that she did with Bishop (bodyswitching) so he got a fully-organic body again in Sam Humphries’ Uncanny XForce, because maybe she couldn’t risk him having any secret weapons in his robot limb that he could use against her.