Should be fixed now :)

Nano Boucher Might be caused by your recent fix for ghouls dying in arena?

Well this is what they do Nutter, they can use "out of combat abilities" while fleeing.
I had the "attack occasionally" thing before but as units run then back towards an enemy it gets recognized as a bug I fear.
Now they would only attack doors or ramparts which block them from getting further to their home.