if you could provide the relevant order history, we can figure out why you have a positive balance when you said you have sold the pair. I don't think there are these type of errors in the platform as you have claimed
Why should it be or any surprise when other people complain about magically disappearing orders and other things... I heard quite a lot of various complaints, so this one is a drop in the ocean that forces me to be deeply distrustful of that site. Also, the story is much the same os the one of the Gox. "We are upgrading."