[Theme Horse Support Team]

Hi Melanie,
Please remove all above css from your custom CSS and try below one:

#access ul li ul li a, 
#access ul li.current-menu-item ul li a, 
#access ul li ul li.current-menu-item a, 
#access ul li.current_page_ancestor ul li a, 
#access ul li.current-menu-ancestor ul li a, 
#access ul li.current_page_item ul li a {
    text-transform : none;
}

Hope this will solve your problem.

Thank you!