I changed the theme on my site but now my website displays a mixture of both the new and old themes. For some reason, some elements of the old theme still appear on the site such as the sidebar and the footer. It's spoiling my UI. When I revert back to the old theme, some elements of the new theme such as the header and menu style remain. Has anyone experienced such a problem, my website looks ok, but it seems I have wasted $69 on a new theme. Can anyone help?