Fortigate ping is not responding if subnet is directly connected

Dear All,

This question is little bit strange but I want to know for My KB. If you see the digram there are three interfaces Port1, Port2 and port3 which are in deffirent subnets. I am able to ping from PC1&2 to my gateway 192.168.1.1 which is absolutely is same subnet but not able to ping 1.1.1.2 and 2.2.2.2 from PC1 and PC2. Why ??

I have configured same thing on Cisco router with three subnet with same subnet, I was able to ping because these are the subnet which directly connected If see the routing table using #show ip route.

I though same thing should be in Fortigate Firewall but it did not work for me.

Can anyone tell me why I am not able to ping from PC1&PC2 (192.168.1.0/24)  to 1.1.1.2&2.2.2.2.

These subnets are also directly connected to Fortigate Firewall.

Thank you for your reply in advance.