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I can see what you mean, I just tested your form:
However, upon cloning the form, and testing my cloned version, the shipping worked:
Please clone my form version in your account and test it, form URL: https://www.jotformpro.com/form/61937906999984?
Here is how to clone it: http://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL
Let us know if you need more help.