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I was able to reproduce the issue.
It looks like there's a bug present in the date difference widget, since my test form was fixed once I removed it. You can see the cloned version of your form (which I used for testing) here: http://form.jotformpro.com/form/43426350095957
I'm submitting this thread to our next support level so they can check and provide a fix for this issue.
Please allow some time for them to evaluate it and once an update regarding this matter shows up, you'll be notified here.
The issue has been fixed - kindly test a copy of your form here: http://form.jotformpro.com/form/43426350095957
Let us know if you have additional challenges - and thank you for your patience.