Sims constantly knocking at door.

I don't know if I'm the only one experiencing this.

Sims in the world are constantly knocking on my door. When other Sims leave because I haven't invited them in, the next Sim arrives and knocks on my Sim's door.

I tried this with a vanilla game (without mods) and I've repaired my game, but it keeps happening.

(I added a picture, so Mortimer Goth is there because I haven't invited him in, so he's leaving. Then Hector Laurent knocks on the door. This keeps happening with other Sims.)