Recently one of the instructors using a Moodle site that I administrate reported that a student was missing who previously was enrolled in a course. I can see from the activity logs when the student was active in the course. However, when I re-enrolled the student, the grades were not restored - I didn't know at the time that I should check the checkbox to attempt to recover grades.
In light of this, I have two questions:
1) Are there any reasons why students would be unenrolled from a course, other than if the administrator/instructor unenrolled them, or if the expiration date for the enrollment was set? I confirmed that neither of those were the case.
2) Is there any way that I can still restore this individual's grades for the course?
When this issue occurred I was using Moodle 2.5, though I am now on Moodle 2.6.