If a course participant has the "Student" role in a course, and also has the "Student" role assigned in the parent course category, the Grades export includes duplicate entries for the participant.

Reproductions:

• assign a Moodle user the "Student" role in a course
• assign the Moodle user the "Student" role in the parent course category
• submit & grade an assignment for the user within the course
• view the course Grades (e.g. grade/report/grader/index.php?id=<course_id>)
• export a plain text file

Expected outcome: One record per student on the course
Actual outcome: Two records per student, one with course crades, and a second without.

e.g.

First name,Surname,ID number,Institution,Department,Email address,Assignment 1,Assignment 2,Assignment 3,Course total

Jake,Abram,004077,,,10abramj@xxxx.co.uk,Complete,Incomplete,Complete,29.41

Jake,Abram,004077,,,10abramj@xxxx.co.uk,-,-,-,-

Josh,Ackers,004078,,,10ackersj@xxxx.co.uk,Complete,Incomplete,Complete,23.53

Josh,Ackers,004078,,,10ackersj@xxxx.co.uk,-,-,-,-

Alice,Adams,004079,,,10adamsa@xxxx.co.uk,Complete,Incomplete,Complete,64.71

Alice,Adams,004079,,,10adamsa@xxxx.co.uk,-,-,-,-

[...]