Invalid alarm clearance information

Hi team

I have a problem The user successfully cleared the system activity alarm command:

<HUAWEI> system-view

[HUAWEI] alarm

[HUAWEI-alarm] clear alarm active

But you can still see the corresponding alarm information using display alarm all

<HUAWEI> display alarm all

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Index Level Date Time Info

1 Emergency 15-12-18 02:29:30 MPU 17: SDRAM CONSIST of MEMORY is abnormal [OID: 1.3.6.1.4.1.2011.5.25.219.2.11.1, EntCode: 144133]

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Why Is the Alarm Information Cleared Using a clear alarm active Invalid?

Thanks