I don't know if this is a glitch or not (hence posting here first), but on items you have bids on is the quantity showing correctly from the store overview page? Mine isn't, see picture. (sorry for stretching screen)
It's the 2nd item down, it shows as qty as 0 but obviously it's 1 or it would not be up for sale..
Now if this is the norm, then surely this could put of bidders as they might think that there is none left, which could stop more bidding wars.