Installed WooCommerce, but it keeps messing up my Nav menu

My nav menu is supposed to look like this https://whippinchickens.com with a black background and have white lettering before you hover over each element. Now it has no black background and just white lettering. This ONLY happens when I install WooCommerce. When I deactivate the WooCommerce plugin, the black background on the nav menu changes back to black from white.

This is for browsers from a computer not a phone. What can I do to correct this? This is my site with woocommerce installed. https://floridashuttleservices.com