Hi! Someone from our discord server let us know that there was a bug that prevents you from getting rewards if you hit continue after the first Event Notifier upon finishing the level.
We are really sorry if you have lost any rewards during this period. We have uploaded a fix for this and have reset all of the rewards in all difficulties. So you can claim it again after finishing the levels even after you have finished it.
Note: Rewards can only be claimed once per difficulty!