Not seeing names or email addresses in surveys distributed/completed via contact list

I created a contact list with first names and email addresses. I used email distributions to distribute a survey to people on this contact list. However, when I download a CSV of the survey responses, "recipient first name" and "recipient email" are just asterisks. So I don't have any way of identifying who the people are that completed the survey. The only unique identifier that I see in the CSV download is "response ID," which is a unique string of characters for each respondent that starts with "R".
So, my question is, is there some setting I need to turn on to identify my respondents via name/email in the CSV? And if not, is there a way to use the "response ID" to identify respondents?

Thanks for your help,
Bradley