AC1900 unable to remove obsolete devices from my access control list

Started having issues with my AC1900's access control list.  I have old devices that I want to remove from the list but can't find a delete option.   So, I've blocked these old devices but they still show up in the connected list and use up an IP. (see attached PNG file). How is this happening?

Additionally,  my iPhones which are allowed devices are showing up as "allowed devices not currently connected" even though the phones show WiFi connection to the router. On both phones, I'm occasionally getting the Netgear "blocked by access control" black & red screen even thought both are allowed devices.  This all just started occurring recently.  I've rebooted the AC1900 via the admin console and I've done a power reset (unplug).   Any help with these problems would be greatly appreciated!  Thank you.