glitch with priority ranking of courses

Numbers in parenthesis after the instructor name in the Assign Instructors:Course view, within the drop down list labeled ‘Asign…’, I thought were there to show the priority ranking that the instructor noted in their teaching preferences.  I’m finding this number doesn’t match up most of the time.  
Example:  Impersonate Matthew Franklin.Fall preferences show ECS20 ranked 2.  Assign Instructors:Course view page shows (3) after Franklin’s name.Winter preferences show ECS20 ranked 3.  Assign Instructors:Course view page shows (4)