I've already made a ticket but I wanted to make a board so other people were aware. If you get a site is down message while quick stocking, which is probably just from something like the connection timing out, whatever the last item was that was supposed to be quick stocked could very well have disappeared. I did this several times and I'm positive it's causing whatever item is the last to not show up, if your quick stocking fails partially way through, to disappear. I imagine this is more likely the more items you have in your inventory as it would take longer and is more likely to time out, if that's the cause, as I suspect, so this can probably be partially remedied by making sure your invo doesn't get too cluttered.