Although this rarely happens, it is a product of e-commerce. While our website inventory is constantly updated, simply adding to cart does not take an item out of inventory. If multiple people have the last item in their cart at the same time, the 1 piece that is left will go to whatever order comes in first.
We try to be as proactive as possible regarding this occurrence. If this happens to you, we can either send you a different color, some store credit, or refund your payment method.