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Please confirm if this was the form http://www.jotform.us/form/51310902260137 you were working on.
I made a test using the form on my Mailchimp account, but so far I did not encounter any issue with the integration.
Just to clarify, you will not need to add an Address field if there is no Address field on you Mailchimp list.
Can you please check if perhaps the MC list have an address field that is looking to mapped to an address field on your form.
I was able to integrate successfully on my test
Let us know if issue persist.