Why do I get a second Submit button after submitting form?

My form asks the user how they want to pay... PayPal or Check (see Page 4).  If the user selects PayPal, then the PayPal components are used on Page 7.  The user then clicks the Submit Membership button and is redirected to PayPal.  All works great!

However, if the user select Check, then I hide the PayPal components on the last page (Page 7).  The user clicks the Submit Membership button and is then presented with another page that I didn't create.  It has another Captcha entry and 'submit form' button.  If the user clicks this second 'submit form' button, then they do not go to PayPal and immediately redirected to my custom Thank You page.  This is all working great except for the second submission page.

Why is this second submission page showing up and how can I get rid of it?

This is a duplicate thread to This is a duplicate thread to https://www.jotform.com/answers/1141460/ which is just addressed and so we are marking this thread as answered. Please be noted that it is not required to open multiple threads for the same issue. We will be addressing all the questions in the order they come in and as assigned. 

Thank you!