Hi thanks for replying!
Umm so i was playing around with ELS cars and stuff, and also i added a mod which gives you EUP uniforms (in the station, and gives NPCs them) and more vehicles: helis etc but I never did anything wrong, it just happened, although I did attempt to change the BCSO cars but didn't like it so i removed them, this was all using the DLC pack File thing by albo so it should have never changed the vehicle so I dunno. Lemme try what you suggested.