Navbar below header?

Hi! I worked with the 2.4.2 version of the catch responsive theme for a while, which was fine. After installing version 2.4.4 for another wordpress installation, I added a custom header image, which caused the navbar to appear above the header. So now it looks like this: Navbar, header, slider. Is there any way to get the navbar below the header image? Kind regards from Germany, Jacky