Causes for submission self-match
If a student submits the same paper to multiple assignments (including draft assignments) in the same Moodle course, the Originality Report will not match the similar earlier papers. This is to allow students and instructors to use the Turnitin Originality Reports as part of a review/resubmit process without generating a “false positive”.
However, similar papers submitted to a different Moodle course will be matched in the Originality Report , even if they are submitted to the same instructor. Also, if the instructor submits the same paper as a “non-enrolled student” to the assignment, then it will still match the student’s previously submitted paper.