only want 1 email receipt, not 2 copies

Hello,

On my form, there is a submit button. After I fill out the form and click on the submit button, I receive two copies of the order instead of one. First copy only shows the basic contact info and order number. Then the second page shows me the contact info, order number and order information details. How can I only get the 2nd copy? I don't need two copies.

Thank you.