Problem with DismanEvent traps

In my "snmpd.conf" file, I set the monitor directives for sending traps as the following:

monitor -r 20 -u test -S -o sysUpTime.0 -I -o lmFanSensorsDevice.1 "ChasisFan4Speed" lmFanSensorsValue.1 < 2000
monitor -r 20 -u test -S -o sysUpTime.0 -I -o lmFanSensorsDevice.2 "ChasisFan3Speed" lmFanSensorsValue.2 < 2000
monitor -r 20 -u test -S -o sysUpTime.0 -I -o lmFanSensorsDevice.5 "ChasisFan1Speed" lmFanSensorsValue.5 < 2000

I tested it by making "ChasisFan4Speed" to 0, and I did get the trap.  This is the message from runnung "-Ddisman":
disman:event:trigger:monitor: Running trigger (ChasisFan4Speed)
disman:event:delta: Bool comparison: (0 < 2000) 1
disman:event:trigger:fire: Firing boolean test: LM-SENSORS-MIB::lmFanSensorsValue.1
disman:event:fire: Event fired (_snmpd, _mteTriggerFired)
disman:event:fire: Firing notification event
disman:event:fire: Adding event objects (first)
disman:event:fire: Adding trigger objects (general)
disman:event:fire: Adding trigger objects (specific)
disman:event:objects: Objects add (snmpd.conf, _BChasisFan4Speed)
disman:event:fire: Adding event objects (internal)
disman:event:trigger:monitor: Running trigger (ChasisFan3Speed)
disman:event:delta: Bool comparison: (3459 < 2000) 0
disman:event:trigger:monitor: Running trigger (ChasisFan1Speed)
disman:event:delta: Bool comparison: (3381 < 2000) 0


But after that, no matter what I do, like making "ChasisFan3Speed" to 0, making "ChasisFan1Speed" to 0, or making "ChasisFan4Speed" back to 3500, I always got:

disman:event:trigger:monitor: Running trigger (ChasisFan4Speed)
disman:event:delta: Bool comparison: (0 < 2000) 1
disman:event:trigger:monitor: Running trigger (ChasisFan3Speed)
disman:event:delta: Bool comparison: (3459 < 2000) 0
disman:event:trigger:monitor: Running trigger (ChasisFan1Speed)
disman:event:delta: Bool comparison: (3381 < 2000) 0

and no traps ever triggered.  Only if I do another snmpwalk or snmpget, the sampling values will be read right again and traps are triggered.  Why?

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