Unwanted ‘Projects’ header appears above actual header on each page

Hi- My website is annabiggs.com. My site has four pages, and on each of them, just above the main title (which I added in Wordpress), is a heading saying 'PROJECTS'. I want to remove this, but I can't find reference to it anywhere within my Wordpress.org admin page. Each time I create a new page, it is there. How can I remove this, please?