The event registration questions and answers are appearing on the autoresponder email that goes out after an event ticket purchase. The questions that weren't answered also appear with the text, "User Provided No Response".
Questions and responses are automatically included in the event ticket purchase autoresponders by a default template. Unfortunately, there is not a way to keep these questions stay hidden.
You can contact your Client Success Manager (CSM) to help facilitate a discussion about customizing this template. If you don't know who your organization's CSM is, then please contact Support and reference this article.