I'm trying to find out if a bidder can bid the same amount twice different dates and times?
The bidder bid twice - but not the same amount. They just raised their max bid. But until another bidder comes along, we can't see what the other bid is.
They can't bid the same amount twice, but if they are the high bidder then the actual amount of their bids won't be known until they're outbid.
No, they can't bid the same amount, but, they also can't bid against themselves. So, until someone comes along to challenge the bid, it will look like they bid the same amount.