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Would you mind me asking you to "Explain more about the issue"? Are you talking about the "Quests"? I am assuming you ARE talking about the "Farm Heroes" game as you posted in this section.
If so -- (1) clearing the Cookies & cache, (2) making sure that there is enough free space available on the device help to get the events back on to the device
Please check that out and post back the result by clicking on the "Quote" below to my post OR simply tapping on "Type your Comment" box.