Help Moving from UTM To XG

Hi, i'm after some help. I 'm moving from UTM to XG.

I have it mostly working, my setup is

Fibre Modem --> XG --> Unifi USG --> LAN

On my XG i have WAN port, LAN port and Mgmt Port

Any device that is in the same subnet as the mgmt port is able to access the internet

All otrher devices in a different subnet are not able to access the internet.

On the XG i have setup static unicast route

Subnet 1 - Interface LAN port cost 1

Subnet 2 - Interface LAN Port cost 1

Subent 3 - Interface LAN port cost 1

Routing table on the XG shows

Subnet 1 - Port 1 (mgmt)

Subnet 2 - Port 3 (LAN)

Subnet 3 - Port 3 (LAN)

It looks like any device on subnet 1 gets a route out via the mgmt port, however doing a tracert shows that devices on subnet 1 go usg --> xg lan --> internet