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Hi, I tried to download Submissions in Excel on both of your form submissions and I am able to replicate this issue in you form http://www.jotformeu.com/form/23323256492351 Submissions.
sorry for the inconvenience. I will escalate this issue to our development team. Will Update you once the Problem is solved.
We opened a bug ticket about it. Please use the CSV option for now instead.
Fix this error via repair excel file 2010
This guide http://www.repairexcel2010.excelrepairtoolbox.com will prompt you how to do it