It seems you have a script that outputs the ban list when it is sent to mIRC.
Each time you open the /channel window, mIRC requests the ban list from the server. mIRC hides this from you, unless you have a script that outputs that for you. The information you are seeing has been formatted by a script, and is definatly not server raw information.
Try using /channel with your remotes turned off (/!remote off), and it shouldn't appear.
mIRC 6.21 - Win XP Pro (SP2) - 2.4 Ghz - 1 GB Mem