Alarms missing

The machine I am monitoring has multiple stops related to out of spec measurement.

Every time it is the same out of spec situation and corresponding same alarm !

The alarms are never acknowledged by the operator !

When I look in the alarm list (page) I only see the last alarm related to this out of spec situation.

All previous (same) alarms are missing in the list ????

Is this because the alarm is every time overwritten by the new alarm of the same type when not acknowledged or do I use the wrong arguments ??

All help is welcome.