entire sims families missing from the game

I restarted my game with a fresh save file. I strictly do not use any mods. When I first restart a sims game. I go into every family in the game and change thier outfits and hair. I did this for the first two worlds. I also like to add the sims I created myself from my library. I added a few characters and when I did it said "some content has not been installed" or something like that, I looked it up and people said it was a visual bug and you could still add your sims. And it seemed they were right. I still was able to add them. I spent hours editing the families that already existed in the worlds. I would edit them, then move them from "played families" to "unplayed sims" in the sim category. When I finally got off for the night and came back the next day, 4 families were completely missing from the game. They were not in the "unplayed sims" category. And were no where in the files I searched. When I edit families I do not save them it my library because when I reupload them the game does not recognize them as the original sim so any pop ups or quest lines delete. All of these familes were originally a part of the world. Like the landgrabs were gone, the goth family, the pancakes. All missing/deleted from the game. I tried to recover my save but the sims were still missing. I do not know if it was the sims from my library that caused the bug to delete other families. But i have most of the expansions and add ons. I do not use mods, why is this happening? I deleted my save again but I'm not sure I want to even bother playing the game again if its going to keep deleting the families I edit.