Create option to allow respondents to edit their responses, especially if the option "single response only" is applied.
In the "Who can fill out this form?" option in the Settings, there is a checkbox you can select to limit one response per person. If tick, the user can only submit one response. If not tick, the user can submit multiple responses.
I think there's a need to create an option to allow respondents to edit their responses, whether the "one response per person" is use or not.