What you're seeing in the bid history is the actual bid (rather than the current high bid) in order of magnitude.
When ey2ly1@msn.com bid USD155, s/he could see that moonflowerkeep was the high bidder, but the then current high bid appeared only as USD150. One s/he'd made his/her bid, s/he'd have got an immediate "you have been outbid" message and the high bid went up to USD156, with moonflowerkeep still the high bidder.