help: why the Security engine ID updated all the time?

Hi,

    I have some trouble with snmpv3 configration.
    I am using  MG-SOFT MIB Brower 4.9. And I created a snmpv3 user, but
the message always like that:

Synchronize:
SNMPv3 report received from remote agent.
Security engine ID updated.
User profile name: no1
Security user name: mifi
Security engine ID: 80.00.1F.88.80.4E.C5.FD.5B.BC.75.87.4F (hex)
Context name: mifirw
Context engine ID: 80.00.1F.88.80.4E.C5.FD.5B.BC.75.87.4F (hex)
Authentication protocol: HMAC SHA
Privacy protocol: CFB AES 128
Security level: Authentication And Privacy
Security model: USM
1: usmStatsUnknownEngineIDs.0 (counter) 10

   usmStatsUnknownEngineIDs.0 counter is always increasing. but I catch the
snmp message,
   the  Security engine ID is not changed, so I can't find the problem。can
you help me?
   very appreciate!

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