Edited the title to be more clear.

This is also an issue with Ragdoll deaths from bullets. It seems that there is a very small gap between a bullet hitting, killing, and then triggering the ragdoll.

There's another Issue here on the tracker that states that ragdolls are too heavy and not random enough ( http://feedback.arma3.com/view.php?id=114 ). I believe the issue is because of the gap, and there being no impulse from the bullet to affect the rogdoll, Hence they all fall the same way when standing still.

wold be good to make preseted ragdoll poses as in FC3

I can no longer reproduce this in the current dev build, and I remember there were some improvements to ragdoll recently, so I'll consider this fixed. If you can still reproduce the issue, please create a ticket asking for this one to be re-opened.