It does this in the app market, not in Haypi Kingdom App. I not longer use Paypal for undisclosed reasons and would love to support this game by purchasing coins. I have found related problems on forums but noting sounds like its what I'm experiencing. I am playing the HD version published by Haypi Inc.
Phone: Droid Razr
OS Version: 2.3.6
App Version: 3.2.3 Haypi Kingdom HD