Custom search filter causes menu and query_posts problems

Use is_main_query() to modify only the main query so menu will stay not affected.

Try This:

add_action( 'pre_get_posts', 'fteh_pre_get_posts' );

    function fteh_pre_get_posts( $query ){
        if( !is_admin() && $query->is_main_query() && isset( $query->query_vars['type'] ) )
            $types = explode( ',', $query->query_vars['type'] );
            $query->set( 'post_type', $types );

        return $query;
    }