When using the A-F+- scale for any activity, when giving a student a mark through the grade book, the grade values are the opposite so giving an A grade actually gives the mark of F (screenshot 1 and 2) and giving an F grade actually gives the mark of A (screenshot 3+4). Using the override to give a different grade makes no difference. There are no additional calculations used and and the letters have their correct association marks (screenshot 6). I did notice that when viewing the grade book setup, the max grade for the letters is F where i presume is should be an A (screenshot 7). I'm not sure how to change this settings. Can any shed any light on the issue? is there a setting that can be changed or a bug with Moodle.