Because I can't post anywhere else, I'm just going to put it here. I am reporting this bug with my game because I know this place is Awesome.
Anyway, what happened was, I installed another EP and this family in Riverblossom Hills were all renamed, and were completely different to what I had typed in Create-A-Sim!
Then, after getting frustrated, being non-Awesome, I deleted the family. Then I installed another EP, and two families in Strangetown were renamed! (Let me note, these were families all created by me, not any EAxis ones).
I'm not sure what to do, and thank you to anyone who gives me any guidance.