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Apologies for the inconvenience. To know more about the sub account user and sharing form's access and submission data, please do check this guide: https://www.jotform.com/help/232-How-to-share-forms-with-a-sub-account-user
Now with regards to the problem, I see you are in EU, to view the form submission data properly, I strongly advise to enable the "Europe Datacenter" option in your Account->Data page if you are in EU. Here's a screenshot to find this option:
This option is our solution for the invalidation of the EU Safe Harbor policy, here's a blog post about this: https://www.jotform.com/blog/178-EU-Safe-Forms-Our-Solution-to-the-EU-Safe-Harbor-Invalidation
Let us know if that resolves the problem.