GalaxyS4 - Tapping power button to turn off screen turns off the phone

So today my power button, when tapped, instead of just turning off the screen, is now opening the shutdown menu as if i've held it, and then just turns off.
The button isn't stuck, and can be tapped to turn the screen on just fine.

It started on an older version, but updating/resetting to factory don't seem to fix it.
Anyone experiencing the same issue or know a way to fix it?

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