The game often loses the weight and status of items in contaners, especailly if you have stacked containers... but rememebrs it again at inconvenient times. It dones't update displays correctl,y it doesn't add values correctly, and it doens't show you that most thigns have an actual in-code weight that goes beyondthe digits displayed: all those thigns that display as weighing nothing actually have fractions of weight which add up, but which don't display, and you can ofte have two items that each weight 2.4lb, but when in your inventory togethr will add a total of 4.9. Almost every item that does not have a flat, non-decimal place weight has hidden tailing weight like this, which adds up.

Beyond that coin weight is also tracked, and not displayed.