Did any one had problem that order which was open has dissapeared from account? I had eos/btc and now it is no more visible even I have history of buying eos/btc?
There is no withdrawal on account so this pair should be there.

Contact the support or creating a ticket and it will be very helpful for you. I guess there was so many people are getting the same problem. It looks like there was a bug and i hope the support can help and fix your problem asap.