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I suggest reviewing the user guide also -Changing-the-Upload-Size-Limit
From the user guide
" JotForm upload max size = 1GB or less per file (use 1048576 value in KB to set the 1GB limit)
JotForm maximum number of files = Recommended value is up to 25 files per request (submission). "
Please make the necessary correction in your form http://www.jotformpro.com/form/41902031426948 as mentioned in the user guide. This is to avoid any issue that could happen due to incorrect settings.
I also checked the submission data of the form in the View Submission page, but so far I see that it was allowing more than 6 uploads in the submission.
If you can guide us where the issue is happening, we will check it as well.
Do let us know if issue still remains.