My Form is not recording average time to complete correctly

Microsoft

I created and sent a 6 question form to three persons to complete. Two were able to submit responses, but the third was not. All are in the same organization. When checking the form, I noticed that the form recorded the average time to complete for the first response was 00:00. The average time to complete for the second person was 1050.57. That was obviously not possible given the length of the responses I received. Does anyone know why this might be happening? Is this a bug in Forms> I want to use it more extensively as part of a learning engagement, but this hiccup gives me pause. Thanks for 

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