[Q] Screen staying on after notification ? topic

So I just recently switched from iPhone to a AT&T Note 4..been fiddling with the settings and seem to of got everything how I like it..but whenever I get a notification of some sort the screen Will stay on until I attend to the power button. Does anybody know the possible cause ? My screen time out is at 30 seconds..checked developer options and the stay awake feature is disabled. Not sure whatsoever of what could be causing this

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