Tag alarm does not clear when the alarm condition becomes false

I have configured an alarm for a tag, most time it works well, but sometime, the alarm does not become clear even the alarm condition become false. is there any idea on what's wrong here?

The alarm setting as below:

The tag value has become within the range, which means the alarm condition becomes false.
Actual value 1.92 is within the EngLow 1.8 and EngHigh 1.98

But the alarm is keep active in the alarm status table:

It seems the new value 1.92 is not evaluated, but I don't know why.

Set the Ack Mode to auto in the alarm settings.
You show it as Manual right now.

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