Why can this VLAN can not ping the other ?

hi guys,

as the image is my network configuration on Fortigate 100E with SW Aruba 2530, i've done:

- VLAN60 running in WAN1

- VLAN62 running in WAN2

configured:

=> port04 on Fortigate is VLAN62 and connect to port23 on SW 2530 (trunk23 and tag). already create VLAN60 and VLAN62 on SW 2530, too. 

=> port03 on SW 2530 is VLAN62 (untagged).

connection: when i put the local IP of VLAN62 for a PC (10.123.62.220) connecting through port03 on SW 2530, this IP can ping any IP of VLAN60 and even other VLAN (for example: 10.123.62.220 can ping 10.123.60.63, 10.123.20.68).

BUT the IP 10.123.60.63 can not ping IP 10.123.62.220 or 10.123.20.68.

i've try many ways but no use...it took me almost a week about this...can please give me some advise about this.