Random drop down menu in Nav Bar

There is a random drop down menu in my header.
I can’t find where it is in the code.

When I ‘Inspect the element’ the HTML is <select></select> under the <nav> heading. When I go into ‘header’ I can’t find that element.

http://www.thistlestopcafe.org

I am fairly new to WordPress so this may be something small that I am overlooking. Thank you in advance!