And I think I know why it's doing it.
Because I'm using MP 2004, it's probably trying to use an icon that's a different set in MP 2002. The numbers go like this:
22 23 24 (No WEP; Red, yellow, green)
26 27 28 (WEP; Red, yellow, green)
http://wxcs.com/wardriving/images/maps/heh.jpg