Weird extra bar beneath page title

When you look at my page, you see from top to bottom the header with the site title and a menu, the page title bar (“Wie is Marit”), a small empty bar and the page content. It’s the small empty bar that’s confusing me. It’s not supposed to be there and it wasn’t there until I installed Yoast. If I de-activate Yoast, the bar dissappears. What is causing the appearance?

The page I need help with: [log in to see the link]