It looks like you haven't received a response on this forum yet. Have you received a response through private message or email? Assuming you haven't, I suggest contacting the code.org staff directly by logging into code.org, going to the upper-right menu and clicking "Report a bug" and filling out that form with the info you reported here.
Do you know what the student actually submitted for those responses? I see in the screen shot some answers are blank, and assuming it's not a free response, it's either marked "incorrect" or "unsubmitted". I too am puzzled by the inconsistency.
Also it sounded like you were viewing those responses while the student was completing the assessment. I'm not sure how actively those results are updated, but I'm guessing the problem still persisted when you checked after the student completed the assessment?