The confirmation page has two buttons that a user can click to proceed onto the payment page. The reason for this is some peoples details can be rather long, especially with a few additional attendees and data, so having a button near the bottom makes sense.
What if your confirmation page is often short or you simply don’t want the button?
A simple CSS fix can remove it for you.
In your themes style.css file, scroll to the bottom and add this code
/* hide second confirmation button */
input#confirm2.btn_event_form_submit {display:none;}