Linux Lite kept turning on Num Lock and making logon confusing, because numbers were accidentally being used.
Refer: https://www.linuxliteos.com/forums/installing-linux-lite/don%27t-want-numlock-enabled-on-login-screen/
$ nano /etc/lightdm/lightdm.conf
Change this line to off:
greeter-setup-script=/usr/bin/numlockx on