I'm no expert on this since I just started using debian (knoppix hd install) last week.

It might be due to the fact that your 7 debian cds are the "stable" release and some of the stuff on knoppix 3.3 is the "testing" release.

Try commenting out all links to ftp site in your /etc/apt/apt.conf file and change your all instances of "testing" to "stable".