</font><font color="blue" class="small">( Why does a history of the bids show the last bidder with the same bid ($6,100) listed 7 times? )</font>
An anxious bidder in first place. He keeps raising his secret maximum bid but the amount that is visible, remains one increment above the second place bidder.
He apparently fears a last minute sniper exceeding his secret maximum bid, moments before the end and too late for him to respond. And his estimate of what that other bid might be, keeps going up.