I like tactile or clicky switches that are on the medium-heavy side (e.g., 55g Topre, Salmon Alps), and compared to some keyboard enthusiasts I see on YouTube, I feel like I type kind or hard.

However, my coworkers who largely use $10 rubber dome over membrane keyboards generally type much harder. I think using keyboards for so long that allow actuation partway through the keystroke has lightened my typing style. People who are used to cheap rubber domes have no choice but to bottom out, and therefore unconsciously absolutely mash every key to prevent missed keystrokes. Sometimes when I have to type on someone else's keyboard, I find that I occasionally don't press hard enough for a key to register.

Ok, I found the issue:
The guide above is wrong: Wire 2 and Wire 3 need to be each one pin above!

Here is how you connect the keyboard to the Teensy:
https://deskthority.net/viewtopic.php?p=519579#p519579

Stuart, Kevin and Bob are going on more adventures!

GLWIC

I discovered something:
When I press M it outputs "nm". But when I hold the M key, it only outputs "m".
So the "n" comes in on the upstroke it seems. Same with other keys.