I Changed My Survey, and Now My Responses Are Missing
If you have a survey that has collected responses and then edited its content, changing a question or editing the answer options could potentially wipe out response data. If this happens, the only way to correct it is to undo the changes made.
As a general rule, do not edit its content if your survey has started collecting responses. Instead, clone your survey and make changes to the new version. It keeps the reporting separate, and you don't lose any data