@Emilyyyy12345 Did you use the moveobjects cheat to place any of the items, or any other objects around the spot where the items disappear? As a test, you could try deleting a number of items (including ones from Build mode, e.g. columns) around that spot and see whether it helps.
@Emilyyyy12345 Since this happens around one particular spot, please try deleting items around that area anyway, just to see whether it helps.
If you can't make the items you place stay put, you can upload the lot to the Gallery, and someone here can take a look at it. Just let us know your Gallery username and the name of the lot, or if you downloaded it from someone else, list their username and the lot's name.
thank you
