I am not aware of any bugs relating to purchases from the store like this.
It sounds like you are using the mobile app. Perhaps if you log in using a browser it will work properly, that will help us determine if it is an app bug or a bug with all of mobile.
In order to test this can you please list:
Device: Ipad air
operating system: iOS version number
App or mobile browser?
If you are unable to get it to work please submit a bug report from within the game for payment issues and the payment department will take care of you 
