Occasionally, UD forgets to put on a 'sticker auto' for a card that is to be AU'ed. It happens a lot, so don't think that you are the only one to experience it. If you contact UD, they will fix that card for you with ease.
LOL... I've seen several Jennings cards that he did not sign... The one guy I knew that pulled one just threw it on eBay hoping to get more money for it when the product first came out... I think he got $14... I think its a cool variation, I'm just surprised no one tried writing an inscription on one of those yet.