I guess it's just the way Listia works, a person can bid a high amount of credits on something they really want, but only the the lowest possible winning bid is shown until the item is either won, or someone manages to out bid the highest bidder.
Can you get listia verified? It will help you out a lot in the long run and helps buyers trust a bit more. If you were verified I would bid a grip of credits on this.
I don't actually know what the highest bid is, it doesn't tell me that. Besides, even if I did know what it was, and told you (or anyone else), I, personally, would see that as cheating. I'm very sorry, but that's just how these things work.