The problem is the permissions:
Quote:
PREVENT TABLET FROM SLEEPING PREVENT PHONE FROM SLEEPING
Allows the app to prevent the tablet from going to sleep. Allows the app to prevent the phone from going to sleep.
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But then it too overrides the system settings unlike the Kindle app:
Quote:
MODIFY GLOBAL SYSTEM SETTINGS
Allows the app to modify the system's settings data. Malicious apps may corrupt your system's configuration.
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That right there could be the issue. I don't think you can do anything about it sadly.