CAPsMAN Wifi Network small issue

I have been using CAPsMAN to manage my WiFi around my house for a few months now, and while i have fantastic WiFi all over the house… I have a few issues with some unusual apps.

Sometimes, a device that is registered to another AP, is unreachable on its ip… but reachable from the router (CAPsMAN), so its like the local LAN is broken up (while the internet etc works fine)… but I want it to be all one flat LAN network, so each devices is as if its plugged all into the same switch.