Looks like they printed one of the two teams on the back (maybe there was some sort of contest depending on which team won) after printing all the cards. Jacksonville was part of card C1, and this is C2. Looks like someone simply ran the wrong card through when they had it set to be Jacksonville and it got out. Print flaw, not listable here. (But kinda cool.)
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).