This is probably because you went to sleep in a certain place, and switched characters while certain characters were still in that area. What you usually do, is tell the person you want gone from the party to leave out in the world. Fast travel to camp, pickup the other person, fast travel out. The game has a habit of saving companions in areas you went to sleep while still in, so if you switch characters to play with and travel to somewhere new, those other characters from the past will still be in the place from which you ended the day at
Last edited by Vallis; 04/01/21 05:21 PM.