Time to Fill Measure using Requisition Open Date in Recruiting - Recruiting Real Time Subject Area

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I'm trying to create a Time to Fill measure using data in the Recruiting - Recruiting Real Time Subject Area. My calculation works but the Requisition Open Date is not pulling the correct date for when the req was first opened. It seems to be pulling the date the req last entered any state within the Open phase. For example, using the history below, I'd expect the Requisition Open Date to be 3/15 but the system reports as 3/30. Is this expected behavior? It seems like Requisition Open Date should be equal to the first event date where the phase code = REQUISITION_OPEN.