Sometimes then i tried to close advertisement and miss, then i quick tried to close the opened browser and return to the game and see the empty space where only white scrollbar at the bottom, also closing ads before reward-timer anyway give a rewards
Should be a bug in the ads provided by 3rd party - game does not have white scroll bars.
Can't fix that, sorry. If you encounter a broken ad, just restart the game - your progress should be saved and you will get the reward
