Screenshot shows that even though a value was put in for buy now, the auction did not end after reaching that value. The server is skyblock, if that detail is somehow important.
That's not how it works though, the auctions can exceed the buynow price however there is a separate command to buy all the items in the auction without having to go through the entire bidding process.
Then could this be clarified when typing in /auc? Because a few people were confused at this. Or even clarified in a post/patch notes/whatever here on the forums.