We have 2 assignments in a course (Moodle v3.3.5) and sometimes the reported gradebook letter does not match the awarded grade (selected from a scale). There is a single student in this course.
Please note the reported grade for Test2 shows - C (C+)
meanwhile in grading of assignment Test2 we have
If I then edit the Test2 awarded grade like this
the gradebook then shows this
The scale used for both assignments is
And the grade letter boundaries like this
