Fudge Points in (Classic) Quiz grading -- not able to delete?!

cpgalt

While grading a quiz, I entered some fudge points and updated score. Then I decided against the fudge points, and deleted them. But when I then updated the score, the fudge points came back. I cannot seem to get rid of them!! (Do i maybe have to enter a '0' instead of delete?)

cpg

audrey_crawford

In a quick test, I found that, yes, you have to enter a 0. Simply deleting the fudge number doesn't update the grade.