Why do I have different FirstOccurrence for the alarm and the child alarms?

I have for an alarm the First Occurrence set to 3/2/17 9AM, and when I open child alarm the FirstOccurrence is 3/2/17 8AM. On the graph I can see that 8AM is the real start of the problem .
Also, on the same list, the alarm above selected is the same alarm, just first anomalious interval (same graph on the third picture, first anomalious interval).

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