Because the seller has decided to "protect" bidder identities, we can't see if there were two bidders or 20.
And remember there is a three hour difference between PDT and EDT time zones. So an East Coast bidder who bids at 9pm will show as bidding at 6pm.
It looks like there were two at the beginning whose bids moved bidding from 1c to $3. Then they went to bed.
On the 23rd another bidder, moves the price to $10. This indicates to me that the $4 bidder has a maximum bid that others will bid against, constantly losing until they bid higher than he did. He bids again on the 23rd leaving a maximum that is higher than the $41 he won with.
It is the highest bid that wins, not the last.
There's a pretty good chance that the two "crystal" sellers are the same person with different accounts. FWIW, those accounts cannot bid on each other.