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We are sorry for the troubles caused to you. I have tried reproducing it on my end, and my already integrated sheets were all properly being updated.
I have also tried integrating a Google Spreadsheet to one of my new forms, and it too is correctly forwarding submission data to the Google Spreadsheet. It has a slight lag of about a minute or two until the submission finally shows up in the spreadsheet, but it works fine on my end.
As there don't seem to be any technical problems that I can see, and if your integrated spreadsheet is not being updated with your submissions, I would advise you to please Remove the existing integration, Save your form, and then try re-integrating the Google Spreadsheet again.
Please let us know if re-integrating the spreadsheet resolves the problem. Thank you.