The logging options System Activity, Debug Information, Attacks, Dropped Packets, Notice don't coincide with the user manual or the router's internal support pages, which describe Firewall and Security, System and Router Status, with verbosity levels of Critical, Warning, Informational.
If the admin web page is attempting to set incompatible logging options, logging filter might simply ignore these settings. I think they have a bug. I already have the latest firmware, so I'm this close to flashing the unit with dd-wrt.