It seems like every other year when I'm playing quake's singleplayer maps (regardless of engine), I end up with a flying rotfish on a random map. The only thing different this time is using DPMod. This one can't move other than to look at me, but sometimes they have. 
Please tell me I'm not the only one who's had this happen before.
Assuming I'm not, does anybody know what causes this, or if it's been fixed in any engines?
Screenshot from E4M7:

Please tell me I'm not the only one who's had this happen before.
Assuming I'm not, does anybody know what causes this, or if it's been fixed in any engines?
Screenshot from E4M7:
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