2012 header changes

I am using a 2012 child theme. I am attempting to move the menu bar below the header image. Whenever the menu bar is placed below the image the dropdown function breaks. Does anyone know why this might be happening?

Do I need to adjust the css or the header.php?

Here is a link to my site:https://whitegolddesign.com
Dropdown options should appear below the store and gallery section of the menu.