Inventory keeps getting deleted

today i updated my game turned on my mods and loaded into one of my family saves and i realized that all of my sims  inventory items were pretty much gone, all that was left was some upgrade parts and a camera, i had wayy more items in there. this also happened to the fridge, toy box and a bookcase, everything was gone!! i played for a little bit (bought my sims their items back to their inventory) and after reloading the game the items were gone once again. how do i fix this? i cannot play the game like this im really disappointed!! i play on pc