I see three possibilities here.
1) is that Topps put the wrong year on the bottom of the cards. I believe 2001 Topps have "2000 Topps" at the bottom of them (at least, I know one year of Topps around the turn of the century did).
2) is that they were issued in 2007 but meant to go with a 2006 set, so the site lists them as 2006. I believe that's the site rules, but someone can correct me if I'm wrong, because it's one of those rules that I'm not totally familiar with yet as I haven't really used it.
3) is that we just plain have them listed in the wrong spot. Those mid-2000s sets of all brands were ridiculous and confusing, so it is a possibility.
I'll never quit collecting entirely, but I am downsizing. Check out my COMC store and help me thin out what I don't want so I can buy cards that I do want. See something you like? Send me a message on here, and we can knock the price down quite a bit. I'll even take a bit of a loss if it means getting you a card you really want.