Gems lost again

while in the arena I see 100 gems come up in my stakes, when it cleared I clicked on the gems as new stakes I stay in the arena for 12 min gems stay there with 14 min left to go I click off the arena to draw a card, When I clicked the arena again, and there is coins where my gems were, I'm not buying any more gems from tynon.. This is the second time this has happened.. I want my stakes back,....... Not Happy

There is a sync problem in that the wrong items are displayed. Your best bet is to do a refresh whenever you see Gems or Leader Cards in the Arena to make sure that is what they really are.