Can't route only one subnet. Help please.

Hello guys, I have a big problem here, I need to route the network through gateway, and, for all others networks its ok and the XG routes everything ok, but, for this network my LAN can't reach an server in subnet.
Below the Unicast routing table for my firewall, and then the kernel routing table (where the gateway for 192.168.1270 subnet is missing)


What I need to do to add the correct gateway for subnet.
It driving me nuts.