If you are talking about the 2 oil cans; there has been no bid retraction and neither one of the 2 bidders have ever retracted.

Can#1 - The one bidder had bid $X, then decided it may not be enough, so they upped their bid, and again later on decided to up it again.

On the second can the same bidders bid $8, the second bidder bid $8.50, then the first bidder bid more, and then decided to increase his bid again..  Why on earth would you not be happy you get people bidding?