This is just hearsay, but I've read somewhere in the german part of the forum that you can solve this problem by editing the settings.ini file for your char.
There, so I've read, should be a line that states the available roles for the Groupfinder-Queue. Just delete the part that states "Heal".
I haven't checked that myself since I didn't encounter that problem, but it might be worth a look.
Thanks it could solve the problem, but i made a ticket now and waiting for an answer.
But on a sidenote i shoudnt be editing any .ini files, they should fix the game.