Cannot remove/block devices from admin web UI [RS300]

I just installed a Nighthawk RS300 wireless router.  I enabled "Access Control" and I was able  to put  the MAC address + name in the list of allowed devices, however, with the admin web UI, I cannot remove any devices that are not already connected, and the other lists are extremely truncated.  The firemware is "Router Firmware Version V1.0.5.22".  I've entert 60 devices.  Of those devices, 10 show as connected, only 2 show up as "allowed and not connected" and only 2 show as "blocked and not connected".  There are 46 entries that are totally missing.