Same thing happened to me. I know I didn't click twice. Same item two postage labels with different tracking numbers. Only one came up to print. I had to make sure that I canceled the right one that I didn't use. I'm going back to Post Office labels. I will be joining the free pro plan, not the free selling as I don't want my buyers to get hit with fees, especially as they won't know the actual extra cost on an auction price till they win.