JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Please try the process of refreshing also.
1. Remove the current existing Google Spreadsheet integration
2. Save the form.
3. Redo the integration and integrate form to Google Spreadsheet again
user guide: -How-to-Integrate-Form-with-Google-Spreadsheet
4. Save the form.
Check now your spreadsheet in your Google account. Check if all existing submissions of the form are now transferred to the spreadsheet.
Hope this help. Let us know if issue persist.