I spent about 2 hair-pulling hours trying to figure out why my mod was putting double the NPCs in some areas. Finally went to check the loaded mods panel to see if I was accidently using an old version...Nope, but I was loading the current and old version at once.
Oops, He He, sorry not really laughing at you just with you as I can remember doing something very similar.
BTW a big hello to Cipscis not seen much of you since being involved in a certain FO3 mod, Oh I'm living even nearer to you now (I think) moved form the Aussie mainland to Tasmania.