I am an account admin and using the Zero Submissions report. I configured the report to show all active enrollments between 5/16/16 and 6/2/16. I reviewed the generated excel sheet and spot checked. I have several students who appear on this report (meaning Canvas believes they have no assignment submissions, quiz submissions or graded discussion posts during the specified time), but when I check the course they have submitted files, completed quizzes, and/or posted to graded discussion posts in the course and section noted in the report.
Any ideas as to how I can track down the cause of the discrepancy? Any known issues with this?