Spontaneous numlock

[dsimic]

Below are the scan codes returned by "showkey -s" on my PineBook Pro, for pressing and releasing Fn+NumLock a total of three times (more precisely, for keeping Fn pressed, and pressing and releasing NumLock three times, but I also tested the "full-fat" version of pressing Fn, pressing NumLock, releasing NumLock and releasing Fn, and as expected there was no difference in the scan codes):

Code:

0x9c
0x45 0xc5
0x45 0xc5
0x45 0xc5

Somehow, the press scan codes (0x45 vs. 0x46) and release scan codes (0xc5 vs. 0xc6) for Fn+NumLock seem to be off by one on your keyboard.  However, the release scan code (0x9c) for Enter seems to be correct.