Hi. I just experienced this problem just now and I was wondering how to fix it. I'll start from the start.
So I have a 7-sim family. They are 2 families which I merged together from 2 different neighborhoods. They are now currently living in Monte Vista. So everything is fine and all until I notice one of my sims, Nick, has a relationship with himself as his boss when I checked the relationships tab. The duplicate Nick in the relationships tab has the exact same job, celebrity level (5 star), social group level, number of traits (I have UL installed so I got up to 7 traits) and everything else! Another sim of mine, Andre, has the exact same problem as Nick.
The weirdest part was I could invite them over. I saved before I invited the duplicate over and I got so creeped out that I just quit the game, without interacting with the duplicate sim. I couldn't delete the duplicate with moveobjects on.
Can anyone help me on this or provide solutions? I don't mind moving to another neighborhood or anything I just need a solution to this.
Thanks everyone!