For some reason the CSS class current-page-item (and current-menu-item) is being added to both the Home and the Staff nav list-items on your homepage:
http://yayclay.com/
I don’t know why this is happening, but I do know:
* That shading (background: #296d92;) is added to current-page-item class on line 473 of:
http://yayclay.com/wp-content/themes/merchant/styles/blue_orange.css
* That class is auto-inserted by either the wp_page_menu() or the wp_nav_menu() functions :
http://codex.wordpress.org/Function_Reference/wp_nav_menu#Backward_Compatibility_with_wp_page_menu.28.29
http://codex.wordpress.org/Function_Reference/wp_page_menu#Menu_Item_CSS_Classes
Can you inspect your theme to see which of the two above functions prints the your header nav menu. Also might help to know what setting you have in Dashboarb> Settings> General> Reading in the Reading Settings screen for “Front page displays” (something is making WP think your homepage is /staff).