'default_state' => 'collapsed', not collapsing group on load

The group remains open after initial page load.

I have the follwing metabox extensions installed:

MB Admin Columns
MB Revision
MB Term Meta
Meta Box Group
Meta Box Conditional Logic
Meta Box Include Exclude
Meta Box Show Hide (Javascript)
Meta Box Updater

$meta_boxes[] = array(
    'id'         => 'C_hotel_previews', 
    'title'      => '<img src="'.get_template_directory_uri().'/assets/metabox/img/cpt-hotel-preview.png">',
    'post_types' => array( 'hotels' ),
    'autosave'   => false,
    'context'    => 'normal',
    'priority'   => 'high',
    'fields'     => array(
        array(
            'name' => 'Hotel Previews',
            'type' => "heading",
            'desc' => 'Add an area and include it\'s corresponding images with descriptions.',
        ),
        // GROUP
        array(
            'id'     => 'hotel_area_group',
            'type'   => 'group',
            'clone'  => true,
            'sort_clone' => true,
            'collapsible' => true,
            'default_state' => 'collapsed',
            'group_title' => array( 'field' => "{$prefix}area_title" ),
            'add_button' => '+ Area',
            'fields' => array(
                // TEXT
                array(
                    'name' => 'Area Title',
                    'id' => "{$prefix}area_title",
                    'type' => 'text',
                    'label_description' => 'Rooms, Swimming Pool, Restaurant, etc...',
                ),
                // GROUP
                array(
                    'id'     => 'slide_group',
                    'type'   => 'group',
                    'clone'  => true,
                    'sort_clone' => true,
                    'collapsible' => true,
                    'default_state' => 'collapsed',
                    'save_state'  => true,
                    'group_title' => 'Slide {#}',
                    'add_button' => '+ Slide',
                    'fields' => array(
                        // IMAGE
                        array(
                            'name'             => 'Image',
                            'id'               => "{$prefix}slide_group_image",
                            'type'             => 'image_advanced',
                            'force_delete'     => false,
                            'max_file_uploads' => 1,
                            'max_status'       => true,
                        ),
                        // WYSIWYG/RICH TEXT EDITOR
                        array(
                            'name' => 'Description',
                            'id'   => "{$prefix}slide_group_wysiwyg",
                            'type' => 'wysiwyg',
                            'raw'  => false,
                            'options' => array(
                                'textarea_rows' => 3,
                                'teeny'         => true,
                                'media_buttons' => false,
                            ),
                        ),
                    ),
                ), // end Group
            ),
        ), // end Group 
    ),
 );