The end time can always be found with each lot. It is therefore possible that within an auction one lot closes earlier than the other. This is because there are auctions in which lots close at different times.
If a bid is placed on a lot during the last 6 minutes before it closes, the auction for this lot is automatically extended in 6-minute blocks after the initial closing time. This way, you have the chance to continue bidding on multiple lots if you would like to win them.
You can see the closing time of each lot at the auction level: