Noticed this feature when creating a double class C network

[cpu]

I just got a RT-AC3200 so I thought I would increase my address space and created a double class C network internally at 172.16.2.0/255.255.254.0 Setup the DHCP and everything else and it all works and looks great except for one thing. When pull up the network map I only see the clients in 172.16.2.1-255 none of the clients in the second half of the network 172.16.3.0-254 seem to show up. I can ping them, I can see them in other places like the DHCP leases and traffic analyzer they just don't show up in the network map clients list.
I'm on 3.0.0.4.378.51_0 everywhere and I see the same thing on both a RT-AC3200 and a RT-AC66U. I have a RT-AC68U but it's down at the moment, I replaced it with the RT-AC3200 and I need to reconfigure it.
Anybody else seen this ? or know of anything that might cause it ?

 

[RMerlin]

The networkmap is hardcoded for a /24.