I created a survey, and have been tracking the responses on a separate google sheet. However, some of the responses that I have seen before have simply disappeared. Your help in this matter would greatly be appreciated.
Are you referring to not seeing responses in the Google sheet or in SurveyGizmo under Results > Individual responses?
Any further details that you can provide might help other users on the Community forum help out – you may consider reaching out to SurveyGizmo support as they will have access to view your survey and have more troubleshooting options: