BTW, I do have one AP "TOOLING" in OMADA network but under 192.168.0.X network. Not sure whether this relate to why the client connected to "P1-PRODUCTION" AP but IP is from 192.168.0.X ?

Hi  @ClassA 

It is the DHCP server that determines what IP address the client will obtain. The EAP is not a DHCP server; it is just a client as well. Usually, the DHCP server is your router. Therefore, to figure out why this is happening, we need to make a judgment based on your network topology and configuration.

What's your requirement about the IP addresses? We may be able to offer suggestions based on your specific needs.

In the meantime, you may refer to the following: 

How to configure Multi-Networks & Multi-SSIDs on Omada SDN Controller

  @ClassA  my i ask what kind of controller did u use?, cause i had some problem when i tried to add an AP to the controller :(