index.php displays site root data

What should be the homepage of the blog (URL indicates the correct page) displays code for the site’s root URL home page.

SITE: http://www.rpk4.com
WORDPRESS: http://www.rpk4.com/rant

Existing WordPress install, no recent new content, not sure when page began doing this. WordPress is a part of the main site and uses latest posts to create home page, not a static home page. Using theme Atahualpa. Can access the admin, posts and pages can be viewed from the admin and a google of the site results in pages being found. It appears the theme is not displaying the header so I switched to 2010,2011,2012,etc and header was loading, index.php still displayed site root code.

Have added all thinkable addresses to congif file (one example below):

define(‘WP_HOME’,’https://www.rpk4.com/rant/’);
define(‘WP_SITEURL’,’https://www.rpk4.com/rant’);

Have contacted the host to see if they can figure out what is going on.
Have freshly installed wordpress and themes and restored.

Any help is appreciated.