I found the problem, this function was causing the problem….
function include_custom_post_types( $query ) {
$custom_post_type = get_query_var( 'post_type' );
if ( is_archive() ) {
if ( empty( $custom_post_type ) ) $query->set( 'post_type' , get_post_types() );
}
if ( is_search() ) {
if ( empty( $custom_post_type ) ) {
$query->set( 'post_type' , array(
'post', 'page', 'website_bookmarks'));
}
}
return $query;
}