I'm using API to place orders on Bibox. If I need to place a market order I put higher/lower price than currently in order book and usually it is executed well but sometimes orders are executed at highest/lowest possible price out-of-market, abnormal candles are drawn as well in the graph. The support is claiming it is normal and money are gone to counter party. How is that possible? It is always working with all exchanges and I never saw this kind of problems. I lost more than 1 ETH which was all of my money for the trading!
Example of the error trade:
http://i67.tinypic.com/292sg07.jpg - this is how 968 TNB was purchased at 0.0008626 instead of 0.000043 !
Almost all exchange can do that if you are not careful enough. So, instead of thinking that things better to become careful in all exchange. Because even the highest exchanger are not perfect enough to manage all of the transactions.
