it seems that you left X you didn't delete /etc/skel and replace it with /home/knoppix. Follow UnderScores How to:

rm –rf /etc/skel

It will remove /etc/skel and its content. Then:

mv /home/knoppix /etc/skel

This will move /home/knoppix to /etc/skel. And at the end change the owner:

chown –R root:root /etc/skel

/home/knoppix is being recreated on every start up