Declare %lol as a local var so no need to unset them, so include \"%lol\" in the \"var ....\" line

Change this line

set %lol %lol $+ , $+ $comchan($nick,%x)

to

%lol = %lol $comchan($nick,%x)

so there is no need to use $replace as the channels are already being added in the variable separated by a space.

Use \"!\" in your ON Join event which means \"except you\"

on !*:JOIN:#: {

:)