authtrapenable is disable but agent is still sending traps

OS is RHEL AS3.0 (2.4.21)
S/W is net-snmp 5.1.2

We explicitly configured to disable the sending of
authentication failure traps with authtrapenable 2
in the snmpd.conf file. When we do SNMP get on the
SNMP agent, the snmpd daemon returns
snmpEnableAuthTraps.0 = disabled.

However, the SNMP trap receiver is still receiving
Authentication failure traps from this SNMP agent.
Our SNMP trap receiver is HP Openview NNM.

The snmpd.conf file we used is attached.