Save reverting to earlier point after CAS

This has happened twice on the same save file today. I had a Sim "Plan Outfit" on the mirror. It was Monday, and when it loaded back to the game, it was Sunday at 3am. The interactions I had my Sims perform the day prior, Sunday, had not taken place. The progress on one Sim's Aspiration Goal had reset, the relationship bars were not the same, and the family dog was still alive (she had passed Monday morning). I had had my two Sims take photos together Monday, and when the game reset, the photos were in the digital frame as if the day had happened. 

After the wedding had taken place, I entered Create a Sim again Monday morning via the "Plan Outfit" interaction on the dresser. I changed the last name for the female Sim, and when it loaded back to the game, it reset to Sunday morning 3am again. The family dog was alive again, progress on her Aspiration Goal had reset again, and the male Sim no longer had a job. The dog the family had adopted Monday was nonexistent. The female Sim's dad was still alive (in a separate household - he had passed Sunday afternoon), etc., etc. I went to the neighborhood screen. The female Sim's aunt (in a separate household who passed away on Monday) was also alive again. But, the name change and outfit change were saved. The family dog was alive. 

It was all a minor annoyance to have to play Sunday over again three times, and luckily I didn't have to do the wedding again on Monday. The relationship status had saved, and the two Sims were listed as each other's spouse on the Profile page on the relationship of each Sim. I guess the two will have to deal with their family members and dog passing away again on Monday.