I encountered a weird bug where when I searched for an item on the marketboard, the list of available items to buy came up, but when I tried purchasing the item, it said "purchase could not be completed" but it took my gil anyways. I guess this has to do with somebody else purchasing the item before me, even though it still appeared as available to buy on my list since I searched before it was bought? Either way, I tried buying it and it took my gil without giving me the item (presumably cuz somebody else got it). Then I tried it again to confirm, and it took my gil once more without giving me the item.