Hello, 
Thank you for the screencapture.
I’ve let the development team know about this issue!
Please note that this is purely a visual bug, and your actual gems inventory is not affected. (Unfortunately you don’t get an extra 42,000,000 or so gems 
)
Please also note that both the gems count going wild and the shop disappearing are both issues related to leaving the game running across daily reset.
Closing and re-entering the desired menu, or closing and reopening Gems of War will resolve this as a temporary workaround!
Thank you for your patience.