If content on your pages has duplicated, the issue is most likely caused by Footer Page Slug field. This field should contain the slug of the page that serves as a template for footer.
The issue occurs when the field contains text that is not page's slug, when the wrong slug is added, or when the template page is not published.
In order to fix this, make sure that Footer Page Slug field contains the slug of the page which you will use as a template for footer.
Also, make sure that the mentioned page is published.
Otherwise, if you won't be using template page to create footer, leave the Footer Page Slug field empty.
For more info and detailed instructions please refer to our Online Theme Documentation.