Visiting lots erases everything built there

whenever i take my sims to a pre-built lot i.e. the darong family palace or the rental lot in tartosa it loads with the lot completely empty. whats more is when i try to interact with the window shopping or nearby vendors, its like there is nothing there and it wont let me click on anything. i've tried playing different families but have the same problem. its affecting all my worlds, pls help?