I was thinking something similar, since the settings are different. I thought they might be tied to the cookies, but I'm not sure. I'll have to check the filters from school and another computer at home, to see which ones show up.
I noticed today that one of the filters wasn't even applied. I found an email in my held mail from one of the mailing lists that I do see a filter for here at work. Are they being checked before or after the blacklists?
Is there an easier way to handle mailing lists, where the message is sent from a user to a list-id which does the forwarding, rather than a message sent from the list-id? Browsing through the forums, I saw a similar question from another user, but no answer. It's not really feasible to whitelist every single user of the list, even if I knew who they all were beforehand.