I did try attacheInterrupt but had the same problem.
^5v INT0
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----------10k pull up ---------switch --------- GND
Similar setup for INT1 I just unplug the wire then connect it to digital pin 3 instead of 2
Why are you saying it could be debouncing issue?
Because of cost issues am using a atmega 8 with the atmega8 NG or older option within the boards menu in the IDE.