Teensy 4.1 won't stop sending single keyboard character despite code clears output - this same code works fine on Teensy 3.2

[AnyWorldGames]

I have a foot controller using 8 paddles.
The code reads the 8 switches, parses that to a given output, and sends that single keyboard character.
It is supposed to be a single character sent one time.
Instead, it sends the same character continuously.
Pressing a different switch changes the output correctly but it also keeps sending.

This code works fine on a Teensy 3.2 and freaks out on the 4.1.

Any ideas? Thank you.

 

[kd5rxt-mark]

Code ??

 

[Turby]

I reckon its on line 42 - its the answer to life, the universe and everything. Apparently...