Lots placed from gallery don't load in game

Hi! I'm having an issue trying to create my own save file, and its happened twice. I am placing lots from the gallery to replace all the EA lots, and I am almost done doing so in all the worlds when I go into build mode in one of the first lots I placed it just isn't there. It's reset to a residential lot (it was a cafe) and the lot is blank. This happened to me a few weeks ago when I was using Srsly's blank save as a base and I thought maybe the save was corrupted but then I started a blank save and reset my game and deleted (and replaced) ALL of my mods and cc to see if that was the problem but its happened again. the more recent lots I placed are still there, but when I'm loaded into a lot I just placed the lots around it that I've changed are the EA version and not updated. Im not sure if maybe my computer/game (i play on a mac laptop) just does not have the capacity to keep up with all the lots I've placed or what the problem is but I'm beyond frustrated as I've spent weeks trying to do this and have already had to restart before.