eBay question: multiple bids of the same amount

Factual Questions
1

I occasionally sell items on eBay (maybe a couple a month). I currently have a old smartphone listed. In 3 days it has 3 bids. But all three are from the same bidder, and for the amount I specified as the minimum bid.

This is the first time I’ve seen this. Why would eBay display this as three bids, rather than just one?

2

He keeps upping his max bid and since no one else has bid it shows up as a new bid.