Thanks again @nevin for everything
I forgot to get out of incognito mode on my browser and after spending about 40 min to configure keys and all that, I could not save the source/hex file because some of the website functionality was limited.... so I had to doit again
After another 20 min, it was faster because I understood how to do everything, I got the HEX, flashed the firmware on my Teensy ++ and right after I plug it in, will start adding commas and semicolons without user imput. No wires attached, bare board just the firmware. Not sure what is happening and how to stop it from doing that from the start.
If I "press" any key, will stop and behave normally.
Anyway, I attached the files I got from kbfirmware.com just in case someone wants to give it a tray and play with it.
I will finish this even if the "bug" continues, does not bother me if starts typing when I first plug it in.
Is gonna bother me if randomly starts doing that or gets worse, starts executing macros.
Layout to be aded on kbfirmware.com
["!","@","#","$","%",{x:2.75},"ESC","WIN","PB","SL","IN","CL","PS","DEL",{x:2.75},"^","&","*","-","+"],
["1","2","3","4","5",{x:2.75},"H","SHH","VU+","VD-","M1","M2","SHE","E",{x:2.75},"6","7","8","9","0"],
["q","w","e","r","t",{x:2.75},"<","1","2","3","4","5","6",">",{x:2.75},"y","u","i","o","p"],
["a","s","d","f","g",{x:2.75},"/","7","8","9","10","11","12","\\",{x:2.75},"h","j","k","l"],
["z","x","c","v","b",{x:2.75},"{","|","_","`","'","\"",";","}",{x:2.75},"n","m"],
[{y:-0.25,x:21.5},"u"],
[{y:-0.75,x:7.75},"(","=","?",":",".","~",",",")"],
[{y:-0.75,x:5},"RET","ALT",{x:9.5},"MEN","RET"],
[{y:-0.5,x:20.5},"l","d","r"],
[{y:-0.75,x:7.75},"[","CS","CA","FX","GEA","DES","PU","]"],
[{y:-0.75,x:5},"SPA","SHI",{x:9.5},"TAB","SPA"],
[{y:-0.25,x:8.75},"CC","CV","CX","CZ","CY","PD"],
[{y:-0.75,x:5},"BKSP","CTRL",{x:9.5},"CMD","BKSP"]