@SummerSloane That's definitely odd, and my first thought is that you happened to not put back one mod or you downloaded a fresh copy or something else that means the content you're using now isn't exactly the same as the content you were using before. Maybe you didn't download a corrupted Sims3Pack this time around? But if you're sure that's not the case, then I'm stumped. It's not even one of those things that "just happens sometimes," it's really very strange.
What I will say though is that as long as the game is working the way you want, nothing else matters. I'd suggest making periodic backups of your Sims 3 user folder though, in case you run into any other trouble and it's easier to restore an old copy of the folder than to reorganize/reinstall everything from scratch. I make a backup whenever I install more store content just because the launcher and store are so finicky, and I really don't want to spend an hour of what could have been playtime reinstalling all my store content.