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Although I can also see issue on how the buttons are displayed
But using the form URL http://www.jotform.us/form/42933849350158 indeed show that the Submit button is hidden
Can you please try adding this CSS codes into your jotform
display: inline-block !important;
It fixes the issue when I did on a test form http://www.jotform.me/form/43147242976460
Follow this user guide : https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes
Hope this help. Inform us if not fixed.