Mib browser precedes every 'get' with 'get sysObjectID'

Mib browser precedes every 'get' with 'get sysObjectID'

In SNMPv2c mode a 'get' works fine.

In SNMPv3 mode a 'get' causes 2 'get' requests.
The first 'get' is always for the sysObjectID.

e.g. below the 'get' is for 'nstAgentModuleObject.0' which works but preceded by 'get' sysObjectID.0

Why is this happening?


Output
======
Sent GET request to 10.186.50.51 : 161 

sysObjectID.0 .iso.org.dod.internet.private.enterprises.netSnmp.netSnmp 
        Enumerations.netSnmpAgentOIDs.10



nstAgentModuleObject.0         2