Auction postponed after auction occurred

[Scott Smull]

I live in NC, where there is a ten day upset bid period on foreclosures, and I was present at a recent foreclosure auction. I literally saw the auction take place and it was done through auction.com. I saw the highest bidder and it went for well above the opening bid. When I went back the next day to upset the highest bid, the clerk if the court couldn't find the paperwork. I called the trustee and the representative I spoke with said the auction has been postponed. I was baffled because how could it be postponed AFTER it had already occurred?  Anyone know how or why this could happen?  Doesn't make sense at all to me. 

Thanks!