What is Status in Legacy SCORM reports?

I'm trying to help instructors understand the Legacy SCORM reports for a bunch of Camtasia quiz videos. What does the Status column refer to in the report? Sometimes it will show Completed for Progress and a red X for Status, other times there is nothing in Progress but sometimes still a red X in Status. It doesn't appear to be related to passing since there is no passing score set on these.

And I have come across some students that have Completed with 100% but still have the red X under Status:

Also, why does time spent sometimes remain at 0:00:00 or remain empty even when there were 3 attempts? Is Time Spent the average for all attempts or overall/cumulative?