Why does http://www.oblivionmodwiki.com/images/2/28/Kill_Corpses_1.jpg happen to corpses?

And is there a fix for it? (other than simply hitting or grabbing them)

Thanks.

As you seem to have two of them at once, how often does that happen to you? I have played the game for hundreds of hours and only seen this happen a couple of times, not often enough to be a problem in any way. I don't know why exactly it happens, but apparently the ragdoll is disabled for corpses and they assume the default skeleton position. Well, physics can be bugged at times in Oblivion, I don't know about a fix for this specific problem.

I got that from google image, but I generally get the same and more often than you it seems.

There are mods that should fix this. Streamline is oner, though it is an older mod with several other features, so you may not want it. But search the Nexus. I'm sure there is a mod that "fixes" it as a stand alone. Technically it's not a fix, it's a workaround. Mods use the PushActorAway function and it does the same as hitting the effected actor or grabbing them. You'll have to walk close to them I would think. You could write a mod yourself, if you feel like it.