there is only one fortigate specific plugin executed (fortigate_ha)
-> Add sections: ['fortigate_ha', 'hr_mem', 'inv_if', 'snmp_extended_info', 'snmp_info', 'snmp_os', 'snmp_uptime']
fortigate_ha: ok
fortigate_ha: skipped (no data)
a quick look shoes it will only inventorize data about fortigate ha systems no firmware versions etc.
The other executed plugins are not fortigate specific.
Can you post here an snmpwalk with the relevant information (OID and data) for the firmware versions etc. please?