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.
Can do what? How you become careful - not to trade? This should be their responsibility to fix bugs and care of traders.
This all looks like they do not match order book records and just randomly buy/sell at their favor. If there is a counter party what kind of order should he place to eat my order?