I've been trying to get the validation to work on this question, but when I use count responses I see unusual results. I share a screenshot where you can see that I have selected only one answer in the entire question, but the count shows 21 answers, row 1 shows 3, and column 4 shows 9. Even weirder is that all the rows and columns also show answers, even if you haven't answered anything.
I think maybe there is something I'm doing wrong or I'm not taking into account.
Attached the survey of the screenshot.
Thank you!