I've posted my second auction. For the first one, bidders made offers and at the close of the auction, I was able to accept the highest bid which was significantly higher than my reserve. With this second auction, bidders are making offers and I'm advised the offer only lasts about 18 hours. This is at the beginning of the week of my auction. Once the 18 hours pass, the bid expires. So I'm receiving subsequent bids but at quite lower levels. Why are the bids timing out before the close of my auction?