While restocking this morning, I've noticed that when I buy an item, it does not reduce the number of items in the shop stock.
For example, say there are two items in stock. I buy one and when I go to buy the next item, it still says there are two items in stock.
The shop hasn't stocked between my purchase of the first and second items so I assume this is a bug. It doesn't happen all the time, but often enough for me to have noticed a trend. Also, it's been happening for me in all shops.
And I'm using Google Chrome on Windows 7.