LTM4676A OCP doesn't work

Set IOUT_OC_FAULT_LIMIT to 1.8 A
      IOUT_OC_WARN_LIMIT to 1.6 A
      IOUT_OC_FAULT_RESPONSE to be "Current limit only"
And use LT4676A output 2V to 1R load and the output current is approach to 2A not clamped at 1.8A.
And the STATUS_IOUT only set IOUTOverCurrentWarning bit.
IOUTOverCurrentFault bit not be set.
Is there something not set for IOUTOverCurrentFault to be work?
The attachment is the LTPowerPlay UI setting result and status report.

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