Objects deleted on upper floor when adding/moving/deleting walls on ground floor

[sillylilguy201]

I haven't posted here before so please bear with me --

My sims have been living in the same house and I was hoping to change the house as I play (the house grows with the Sims inside sort of thing). I already redecorated/rearranged the top floor to be exactly how I wanted, and want to do the same with the ground floor.

PROBLEM IS that whenever I add/move/delete walls on the ground floor, SOMETHING gets deleted on the top floor.

1. The wall in question and the top floor as-is.

2. AFTER the wall is deleted, a lot of items disappear from the floor above.

I noticed a couple threads saying it's been fixed, but this issue has made me halt working on the house for now until I can figure out how to overcome it  

[luthienrising]

@sillylilguy201 How odd! I wonder if there's something specific to that build making it happen.

A couple of things: You could save the upstairs rooms to your Library then put them back after you finish the ground floor. Also, now and then saving the whole lot to the Library then bulldozing and putting it back makes odd glitches go away.