Multiple Custom Post Types one not displaying.

I have this strange behaviour happening with multiple custom post types. I am sure the code for each CPT is correct, as I am able to get them to display on the admin menu, but I can only get 4 to display at any one time. There is always one missing from the menu. I am wondering if this has anything to do with the menu position !? I just can’t figure this one out.

Here is the code I am implementing, any assistance would be greatly appreciated. Thanks

<?php
add_action ('init','custom_post_types');

function custom_post_types() {

        $labels = array(
            'name'              => _x( 'Slides', 'post type general name' ),
            'singular_name'     => _x( 'Slide', 'post type singular name' ),
            'add_new'           => __( 'Add New Slide' ),
            'add_new_item'      => __( 'Add New Slide' ),
            'edit_item'         => __( 'Edit Slide' ),
            'new_item'          => __( 'New Slide' ),
            'view_item'         => __( 'View Slide' ),
            'search_items'      => __( 'Search Slides' ),
            'not_found'         => __( 'Slide' ),
            'not_found_in_trash'=> __( 'Slide' ),
            'parent_item_colon' => __( 'Slide' ),
            'menu_name'         => __( 'Slides' )
        );
        $taxonomies = array();
        $supports = array('title','thumbnail');
        $post_type_args = array(
            'labels'            => $labels,
            'singular_label'    => __('Slide'),
            'public'            => true,
            'show_ui'           => true,
            'publicly_queryable'=> true,
            'query_var'         => true,
            'capability_type'   => 'post',
            'has_archive'       => false,
            'hierarchical'      => false,
            'rewrite'           => array( 'slug' => 'slides', 'with_front' => false ),
            'supports'          => $supports,
            'menu_position'     => 25, // Where it is in the menu. Change to 6 and it's below posts. 11 and it's below media, etc.
            'menu_icon'         => get_template_directory_uri() . '/inc/slider/images/icon.png',
            'taxonomies'        => $taxonomies
        );
        register_post_type('slides',$post_type_args);

		register_post_type('homepage-highlight',
			array (
				'labels' => array(
					'name' => __('Homepage Highlight'),
					'singular_name' => __('Homepage Highlight'),
					'add_new' => __('Add New', 'Homepage Highlight'),
		    		'add_new_item' => __('Add New Homepage Highlight'),
		    		'edit_item' => __('Edit Homepage Highlight'),
		    		'new_item' => __('New Homepage Highlight'),
		    		'all_items' => __('All HP Highlights'),
		    		'view_item' => __('View Homepage Highlights'),
		    		'search_items' => __('Search Homepage Highlights'),
		    		'not_found' =>  __('No Homepage Highlights found'),
		    		'not_found_in_trash' => __('No Homepage Highlights found in Trash'),
		    		'menu_name' => __('HP Highlights')
				),
				'public' => true,
				'has_archive' => true,
				'show_ui' => true,
				'show_in_nav_menus' => true,
				'menu_position' => 26,
				'supports' => array('title','excerpt','thumbnail','custom-fields')
			)
		);

		register_post_type('specials',
			array (
				'labels' => array(
					'name' => __('Specials'),
					'singular_name' => __('Special'),
					'add_new' => __('Add New', 'special'),
		    		'add_new_item' => __('Add New Special'),
		    		'edit_item' => __('Edit Special'),
		    		'new_item' => __('New Special'),
		    		'all_items' => __('All Specials'),
		    		'view_item' => __('View Special'),
		    		'search_items' => __('Search Specials'),
		    		'not_found' =>  __('No specials found'),
		    		'not_found_in_trash' => __('No specials found in Trash'),
		    		'menu_name' => __('Specials')
				),
				'public' => true,
				'has_archive' => true,
				'show_ui' => true,
				'show_in_menu' => true,
				'menu_position' => 27
			)
		);

		register_post_type('testimonials',
			array (
				'labels' => array(
					'name' => __('Testimonials'),
					'singular_name' => __('Testimonial'),
					'add_new' => __('Add New', 'testimonial'),
		    		'add_new_item' => __('Add New Testimonial'),
		    		'edit_item' => __('Edit Testimonial'),
		    		'new_item' => __('New Testimonial'),
		    		'all_items' => __('All Testimonials'),
		    		'view_item' => __('View Testimonials'),
		    		'search_items' => __('Search Testimonials'),
		    		'not_found' =>  __('No Testimonials found'),
		    		'not_found_in_trash' => __('No Testimonials found in Trash'),
		    		'menu_name' => __('Testimonials')
				),
				'public' => true,
				'has_archive' => true,
				'show_ui' => true,
				'show_in_menu' => true,
				'menu_position' => 28
			)
		);

		register_post_type('events',
			array (
				'labels' => array(
					'name' => __('Events'),
					'singular_name' => __('Event'),
					'add_new' => __('Add New', 'event'),
		    		'add_new_item' => __('Add New Event'),
		    		'edit_item' => __('Edit Event'),
		    		'new_item' => __('New Event'),
		    		'all_items' => __('All Events'),
		    		'view_item' => __('View Event'),
		    		'search_items' => __('Search Events'),
		    		'not_found' =>  __('No events found'),
		    		'not_found_in_trash' => __('No events found in Trash'),
		    		'menu_name' => __('Events')
				),
				'public' => true,
				'has_archive' => true,
				'show_in_menu' => true,
				'show_ui' => true,
				'menu_position' => 29
			)
		);
}
?>

Thanks