I saw the same thing yesterday except one of them could be targeted and attacked. I\'m pretty sure it\'s a graphics glitch, when the server uploads a packet to your client (or mine) that gets stuck in the client in a loop. Yeah, that probably only made sence to me. Oh well. Once though, every time I killed a monster, it remained standing there. Soon, but only for me, it got very crowded in the dungeons. Hehe.
I don\'t think it\'s a fix-it-soon bug since it\'s only graphic-aesthethic, but I would think you maybe should post it on bugtracker nevertheless.
Xirius