Hello Dragon, I apologize for the inconvenience but do note that our Market feature is still in beta stages.
As an Operations personnel, I do not have the tools to re-open the auction at the moment. Therefore I suggest you recreate the auction and ensure that auto-win is left blank (Yes I am aware that you left it blank before too). If you encounter the same problem again, report back here. Meanwhile, we'll review the issue and remedy it if possible in our next update.
Thank you for your patience.