Ideas
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).
This is happening to me too. I was wondering if it was somehow tied to Enchanted By Nature but I see that it's not among the packs you own. While it's not exactly a gamebreaking glitch, it is annoying and immersion breaking. And I'd only just returned to werewolves gameplay too after the pigment glitch was fixed.