Namewinner does this sometimes. I've had two instances where I had the high bid on the domain and it states that it closed. A couple of days later I will get an email billing me for the domain and it will be in my account. They were both dot coms though. Possibly won by another snapback service, defaulted payment, and relinquished to NameWinner? I don't know, better warm up the Mystery Machine and try to solve the mystery.