I don't know, honestly .... I'd message each person winning, and see if you can get listia to delete one. .. I saw a few auctions like this around, and double comments. .. it's been acting up lately. .. :(
Go to bottom of this page and hit member support then go to very bottom and it will say submit a support ticket hit that and then it will ask you some questions. You will need auction link. Something similar happened to me and they responded and took auction down rather quick. Hope this helps