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Are you referring to this http://www.jotform.com/51276147758161 form? I see it is showing the correct format:
You can always change the format on the edit mode of your form by click on the date field, and change it with the Date Format button:
If you don't see any changes, try clearing your forms cache: http://www.jotform.com/help/229-How-to-Clear-your-Form-Cache
Let us know if you need more help, we will be glad to assist you.