Getting 429 error on second child pages in custom post type

Hello,

Im getting a 429 error (Too Many Requests) on all of my second child pages in my Key Services CPT. The first child isn't getting the error only the second. Could it be related to the way the CPT is set up in functions.php?

register_post_type( 'mgm_keyservices',
array(
'labels' => array(
    'name' => __( 'Key Services' ),
    'singular_name' => __( 'Key Service' ),
    'menu_name' => __( 'Key Services' ),
                'add_new_item' => __( 'Add New Key Service' ),
                'parent_item_colon' => __( 'Parent Key Service:' ),
),
'public' => true,
'hierarchical' => true,
'has_archive' => true,
'rewrite' => array('slug' => 'keyservices','with_front' => false),
'menu_position' => 5,
'menu_icon' => 'dashicons-image-filter',
'show_in_rest' => false,
'supports' => array( 'title', 'editor', 'thumbnail', 'excerpt', 'page-attributes' )
)
);