Hello 
Thank you for confirming.
I’ve let the development team know that this isn’t ongoing. And for your own information, this issue is currently suspected to be a purely visual one, which can happen if a connection issue occurs.
Should you encounter any visual purchasing issues like this one in the future, I would suggest always double checking the purchase popup confirmation window’s pricing, and to also close and reopen your Gems of War game to refresh it.
I hope this clarifies things