Submenu falling behind featured image

Hello. I am using the gutenify logistics theme, and I am having a issue where my submenu dropdown box is falling behind my featured images on the different pages. The submenu drops down and shows on the homepage, but on every other page it falls behind the header/featured image. I am new to wordpress and know little about the custom CSS, but any help would be very much needed.

Thanks.

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