Hey, is the character rigged? (the mesh rigged to a skeleton for animation)? Looks with the stretching at the wrist as maybe the character was rigged in one pose where the rigging worked for that pose, then ue4 is using another pose where for some reason the hand bones are in a different rotation/location causing the stretching?
Looks like the wrist joint has been rotated 180deg and the skeleton hand bone runs behind the hand rather than through the middle of it so the hand is orbiting round the bone rather than rotating with it…
Not sure why he’s stretching across the map, maybe need to add screenshot of that as well…