Looking at your source code and the browser inspector, I think it may be something in the custom Brand Header Theme component that adds a Hamburger-Brand-Menu. I think I’d check there first and see if that can help narrow it down. 
Looking at your source code and the browser inspector, I think it may be something in the custom Brand Header Theme component that adds a Hamburger-Brand-Menu. I think I’d check there first and see if that can help narrow it down.