It’s most likely that you did not remove enough material from the underside of the fret button.
There should be roughly 3 mm of travel when the fret button is pushed.
The quick(ish) test:
- Open the guitar neck
- Remove the PC board
- remove the offending fret buttons
- Replace the PC board and screw down
- Put the neck together with rubber bands
- Put it back on the guitar body and test it