Duplicate menu on child theme

Hi,

I’m trying to create a child theme for the Bushwick theme, for some reason when I do this, I get two menu icons in the top right (and only one works) – http://veegan.co.uk/

Here’s my style.css (it’s empty!):

/*
 Theme Name:   Bushwick Child
 Description:  Bushwick Child Theme
 Template:     bushwick
*/

And here’s my functions.php:

add_action( 'wp_enqueue_scripts', 'theme_enqueue_styles' );
function theme_enqueue_styles() {
    wp_enqueue_style( 'bushwick', get_template_directory_uri() . '/style.css' );
}

I cannot see anything which would cause the icon to duplicate, any ideas please? Thank you 🙂