Hello !
I think this is a common problem from ArmA 3. The physics engine is creating the ragdolls randomly. So if you kill somone he is falling to ground and the body parts can go everywhere.
I am not sure but I think BI added this feature with one of the last updates. And because this is a new feature it's a little bit laggy. Sometimes I have this problem too but usual it's fine.
Well, I am not exactly sure but this is my theory.
Have a great day (night) ! :pet11: