The exact same thing happened to me multiple times with Fairlay. I place an order. A few minutes later I check my betting history and I see that they placed my wager on the opposite outcome. This is an unacceptable bug in the Fairlay system that should be fixed asap. In fact I believe this is the single most important issue with the Fairlay website. Because of this issue I no longer bet with Fairlay. Because where is the guarantee that it won't happen again? As some of you guys already mentioned there is no way to prove what happened. Some of you guys mentioned taking screenshot as a solution. But what exactly should I take screenshot of? By this time Fairlay should already be very aware of this bug in their system. I hope they address this issue as soon as possible because their website is otherwise not bad at all and as far as I know there is no other bitcoin betting exchange with comparable liquidity in the market.