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I was able to see the issue on the submission data of your jotform http://www.jotformpro.com/form/50956487841973 also.
I assume you use the JotForm Import Data App to import the xlsx data.
When I checked the submission data, its shows 1k new submissions and there are existing submissions.
but on the View Submission page, it is empty
May I inquire if the 1K new submission was the number you tried importing from xlsx data?
Was there an existing submission to the form before you imported a new data?
I need to get more details about the issue also before I can submit a bug ticket report to our higher team support.