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Do you have 10k resistors between gate and ground on your MOSFETs? You might be suffering from residual charge on your MOSFET gate keeping it on when it should be off.
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Based on your experience with the system and the source of the Nanos, the best and quickest test I can think of is to swap in a another Nano to find out whether if the problem remains or disappears.
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In your approach a button press will be detected every 100ms when you just keep the button pressed. So you have to set a flag when the button is pressed. When the button is not pressed while your flag is set, that's the event you're looking for. In this way you can detect both a button press and a release respectively.
As @JRobert mentioned, there still has ...
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The "Serial Monitor" is merely a window to the Arduino's serial port. You don't have to use it to use Serial. It's just a (very simple) built in way of seeing the data.
You can use the Serial interface with your own software, or with third party software. It's not tied to the Serial Monitor in any way at all.
So:
Use Serial.print() etc to send data to the ...
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