The $25 sure looks like the bid amount to me. That's what it say it is, that's what it has always been on every other Ebay auction I've seen.
How? While the auction is taking place, it doesn't show you the max bid that anyone has put in, only the current highest bid. I could put if $31 and it the previous highest bid was $24.50, it would take it up to $25 and that is all you would know. That is how it works.
What you have there is something unusual, I've never seen anything like it, looks like a software glitch to me.