Hello @leontan15,

While we have inspected your website URL, the CSS implemented for the primary menu seems to be applied from the Max Mega Menu Plugin itself and not the theme styles.

Please make sure the layout / styling for the mega menu is applied correctly in the plugin itself from the WordPress dashboard.

Alternatively, you can also remove the theme default navigation wrappers by creating child theme add adding in the following code in your child theme’s functions.php file :

/**
 * Site branding.
 *
 * @since 1.0.0
 */
function travel_eye_add_primary_navigation() {
	wp_nav_menu( array(
		'theme_location' => 'primary',
		'menu_id'        => 'primary-menu',
		'fallback_cb'    => 'travel_eye_primary_navigation_fallback',
	) );
}

Hope this Helps,

Best Regards !!