I made a purchase on march 2 for 99.00 I still had remaing sapphires and when I was topped up again with my purchase. i was still out roughly 30k in sapphires..also just finished 2 days ago battlegrounds finished 6th place it showed my winnings but I didn't get the dragon Mark's for constructing dragons ..

Hello!

There are no bugs related to Sapphires' disappearance. 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 Sapphires are commonly spent.