Jan 18, 2019, 11:3101/18/19
Hello!
There are no bugs related to the disappearance of the Rubies. The game is developed the way that the in-game currency can be spent only on in-game purchases. Please follow this article to learn where the Rubies are commonly spent.
If you consider the Rubies have been lost due to a bug, please provide us with the steps to reproduce the issue. Here is an instruction on how to report bugs.