Port forwarding is not working on latest firmware.

If I add a port forwarding and select device and add it to port forwarding everything looks okay, but if I exit the app and go back to port forwarding the device ip has changed to 0, for example if I use the subnet 255.255.0.0 and the device ip is 172.16.1.100 it will change to 172.16.0.100.

It's related to the subnet used but one octet always changes to 0.

See photos for explaining