Weird mixamo animations

I have a character I downloaded from Mixamo with animations. I then got a gun off the asset store. The thing was, the gun didn't fit properly into the characters hand. So I attached the gun to the right hand ( Where the trigger is ) and use SetIKPosition() and those functions to have the left hand follow the barrel of the gun. But only when I'm using the animations from mixamo the left-hand fingers mesh is messed up. The fingers are pointing in every direction, but I'm not sure if they are stretched.