“When I open the about us page I see the articles from blog articles category. When I click on the title of the article It opens in the page content section of the homepage.”
Do you mean instead opening the article page, it redirect to the home page ? If so, that mean you didn’t create the blog layout for blog content.
From this demo http://demo.joomlead.com/believe/index.php/features/about-us
if you click to any article link, it will open the article page like http://demo.joomlead.com/believe/index.php/blog-articles/27-lorem-ipsum-dolor-sit-amet-consectetur-adipiscing-elit
Is it possible for me to check your current site ?