App keeps boucing when installed on phone!

when i test my app with the campaign

works fine , when exporting and install on phone it keeps bouncing as show in the video attached…
pls advice

The reason that it is bouncing probably is that there is a mistake in somewhere in your code. You might have closed and opened the screen multiple times, causing this “bouncing” effect. If you don’t mind, please post a screenshot of the relevant blocks of that screen.

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solved by removing the “Timer always fires” option…
thanks all