Bought Egypt Mythology and started using. Saved and purchase not there

I Bought Egypt Mythology from the Marketplace and installed fine. I created a new world using this as a resource pack and it worked perfectly. I saved the game but when i reopen the saved game it has defaulted to the standard minecraft. I also cannot access Egypt Mythology even though I have paid for it; if i attempt to click on it in resource packs the game tries to make me pay for it again.  I have searched the forums but cannot find a solution to this.