Dragon Battle Accept Reward button can accidentally deduct sapphires.
Sometimes when you click on "Accept Reward", it will register as "Refresh Mana" and 150 sapphires will be deducted with no recourse. Accidental double clicks are not uncommon on web based interfaces. This has happened to me twice. At the least, the "Refresh Mana" button should be moved so its not directly beneath the "Accept Reward" button to avoid accidental clicks. At the best, my 300 Sapphires could be restored. :) .