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Please apply this changes in your jotform http://www.jotform.us/form/43196188433158
1. Lessen the form widht
2. Change the Submit button alignment to Left instead
3. Save the form.
4. Re-embed the form again into your website using the default embed code
Hope this help. Inform us if the issue persist.
Btw, I was able to see the problem also when I checked on your website
But I think it is just a matter of re-positioning option on the form. So, try my suggested modification previously and inform us if it works or not.