The post “About us” on main page appears on each page

Hi! I have a problem with the post "About us" on the main page. I created a menu, and I don't know why, on each page, it keeps appearing the post "about us" with the photo on the top of that page (before the content of the page). I check it, and I just have 1 post created. The website is: http://laiasaga.byethost6.com I hope someone can help me, Thank you!