When i am enabling a guest network or an IoT network on my Deco X90 (in router mode) the devices that i add on those new enabled networks keep getting IP numbers in the same range and with the same subnet mask as my devices in the main network.

I checked this by pinging from one network to the other from devices not in the same network.  I also rebooted my Deco X90 after making the guest and IoT network before using them but with the same 'problem'. It's weird that both networks aren't isolated from the main in spite of what i still read in comments or find in support files.

Hope you can help me out on this.