Well, there's obviously something wrong with those numbers. According to that list, "Miss-Hiwatari" was last seen on 2005-09-03 18:17:00 (almost three days earlier than some of the other entries). For some reason, people aren't being removed from the list.
I also notice that you have a bunch of field in that table that don't belong there. "color", "current_page", "current_page_id" and "current_ip" are non-standard fields in the online table. This leads me to believe you've installed some kind of mod (which doesn't appear to be working either). Start by replacing the affected files with fresh copies from 1.2.7 and see what happens.
"Programming is like sex: one mistake and you have to support it for the rest of your life."