Item Analysis showing "Ungraded Answers"

In Quizzes, I ran Quiz Statistics, Item Analysis.

Out of 20 questions, 14 give the "% answered correctly" and "Discrimination Index".

However, 6 questions are listed as "Ungraded Answers" with no statistics. (It just shows the number responded, with no results).

Upon checking the students quizzes, it appears all questions were graded.

Why is the Item Analysis showing "Ungraded answers"

Here is an example:

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