I am working on animating a weapon and this is the first time i've used the overlay animation. And when I move around everythings a bit off track (like hand moves a bit from the gun) and I think it's only when the moving, overlay and another animation is playing. I have taken it off and everything works fine together (moving + another animation).

I've tried rekeying everything but I get the same results.

btw I am linking my hand IK helpers to the gun for animating and then linking them to frame when finished, so this maybe messing up some keyframe info? but like I said it works fine as long as the overlay animation isn't applied.

You should be adding link constraints from the wrist controllers to frame gun and then parenting frame gun to frame bone24. if in the overlays the hands move off of the gun during the animation, then the hands will do so likewise during gameplay. the only exception to this is when you have non-overlay animations playing at the same time as overlay animations (ie, having reload, walking and turning at same time). Some parts may move slightly in accordance to the turning overlay

i think that should help