It looks like something odd is going on with keymaps. On two computers, I run:

 sudo logkeys -s -u --no-daemon

I add keycode logging by adding a printf in update_key_state at the top of the default case.

On both, I press the "1" button. On both computers, keycode 2 is registered, which matches what I expect from ex. https://github.com/torvalds/linux/blob/master/include/uapi/linux/input-event-codes.h. On both, I see /var/log/logkeys.log log key 2 as being pressed (incorrect).

On both, I press the "q" button. On both computers, keycode 16 is registered.
One one computer, w is logged to the file. On the other, q is logged to the file.

In short, they don't seem to be using the same keymap, even though -u is passed.