@indycutie Are you currently using mods? I don't remember whether you were when you last posted. If you are, please let me know which ones. If not, let me know whether you're willing to add a few.
If you don't want to use mods, there's only one good way to reset things short of transferring your sims to a new save. Go to Edit Town, evict your sims, save their house, bulldoze the lot, place the saved copy of their house, and move the sims back in. If you do all this in one Edit Town session, without also saving the sims to the bin and placing their bin copy, your sims will keep their jobs and relationships, although they'll lose their promised wishes and opportunities.
I'm not sure this will fix the issues with the save though. If it doesn't, adding mods or starting a new save are your only options.