In JCampus if a student has an "I" as one of the letter grades for an assignment, it is defaulting the letter grade to an I. It seems like it is calculating it in the average as a "0", but it is not giving the correct letter grade.
One assignment with a grade of “I” gives you an incomplete final average. You have to make it up or change it to something else (E,X,0,F, etc.). It is averaging as a zero.