From your post and other comments it sounds like you’re under double NAT when connected to the deco access points.
In order to solve this, go to the deco app. Go to more -> advanced -> operation mode and change it to access point mode.
This will stop the main deco acting as a router and will hand over DNS, DHCP, routing and other such things to the main router, thus keeping your docker containers and devices connected to the deco’s on the same network