TS2 - Sims change into random townies on reload

Yep, I had to recreate my sim after she went on a date at another lot and completely disappeared. I didn’t think much of it until it happened again! I didn’t get a pic of the first time, but the second time, my sim named Mimi Mason turned into a sim named Sadie McClellan. Yet she still had Mimi’s career and relationships. My cat was unaffected. So frustrating and hope this is fixed soon…