Floating gray bar

I have an issue where the gray “triangle” that is supposed to peak into the top of the header is floating in the middle of my header instead. This happens whether or not I have a header image enabled. I have not made any edits to the code (only changing the settings) so I’m not sure why this has happened as I know the theme works on other people’s sites. Is there any way to fix this?

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