Asphalt 7 not showing in purchased apps!! HELP!

When on iOS 6, i had downloaded Asphalt 7 heat from the app store for free, when it was the app of the week. I updated it many times from the app store after that. But, when installing iOS 7, i restored my ipad. And now when i open Asphalt 7, in the app store, it asks me to purchase it again! Nor does it show in the purchased section! Please help!!