Gunbroker; minimum bid increase?

[Sisco]

Never bought a gun off Gunbroker before but I feel the need for a Ruger Blackhawk in 41 mag.
Had one marked in my "Watch list", NIB in box for less (including shipping and transfer fees) than I can get a used one locally.
Anyway, checked the auction this afternoon and the minimum bid had gone up by $25. This is a no-reserve auction and there are no bidders. Seller has a A+ feedback rating, I read through them and saw nothing but good stuff.
Is this a common thing?

 

[striker3]

I am not very familiar with Gunbroker's rules, but in most of the auction sites that I have sold through, the seller has the right to change the auction in any way up until the moment that the first bid is placed. After the bid is placed, then that is when everything is frozen as is.

As far as this being a common practice, I have never noticed a seller do this before. But maybe he made a typo when he was entering the amount, who knows?