Same thing has happened to me. I looked on their twitter page and they are saying that it is a glitch on the system and the orders that have been cancelled will not be going back up to pre order to others online. They are saying that any order that has been cancelled will be reinstated on monday so best to contact them then. The number to contact is at the bottom of the email they have sent out and also been posted by a member here
hope we all manage to get our orders back. good luck guys