Why Opmanager cannot auto detect "type" of Fortigate (use add snmp)???

Fortigate Template default (have add some new SysOID): parameter monitor CPU, Memory, Active Session have not data collection happened.

       Memory Utilization OID:  .1.3.6.1.4.1.12356.1.9.0

       CPU Utilization OID:  .1.3.6.1.4.1.12356.1.8.0

       Active Session Count OID:  .1.3.6.1.4.1.12356.1.10.0

Fortigate template custom:  parameter monitor CPU, Memory, Active Session have data collection happened.

      cpu OID:  .1.3.6.1.4.1.12356.101.3.2.1.1.5

      mem OID:  .1.3.6.1.4.1.12356.101.3.2.1.1.6

      activesesions OID:  .1.3.6.1.4.1.12356.101.4.1.8.0

Thanks.