Hello, I have the same problem.
I haven't played with the werewolves pack in some time and yesterday I started a new save file with a new werewolf sim and as others said in both werewolves packs there were some random sims hanging around the groups' hangouts. I'm also pretty sure most of them are not werewolves because of the negative interactions when you do werewolves things.
Another thing I noticed is that both Rory and Kristopher (the npcs) entered a career as soon as I started the savefile, as one of their interactions after meeting them was "Congratulate on new job" for both of them!
I'm on PC, no mods, no cc. I don't own all the packs (i haven't bought a new pack since Horse Ranch).