[RELATED] is not working properly

in the listing the shortcode [RELATED] is just going in order not by the category. I tried adding seeral extra css code like

[RELATED orderby=rand]

doesn’t work.

i check the php file it does not seem it have the option to do so.

my question is how can i add that feature if possible?

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function wlt_shortcode_related($atts, $content = null){ global $wpdb, $wp_query, $CORE, $post;

extract( shortcode_atts( array( ‘view’ => ”, ‘perrow’ => 3 ), $atts ) );

if(isset($GLOBALS[‘relatedisset’])){ return; }
$GLOBALS[‘relatedisset’] = true;

if(isset($GLOBALS[‘flag-single’])){ $wasset=1; unset($GLOBALS[‘flag-single’]); }

ob_start();
?>

<div id=”wlt_shortcode_related” class=”owl-carousel wlt_search_results grid_style”>
<?php echo do_shortcode(‘[LISTINGS dataonly=1 show=12 custom=”related”]’); ?>
</div>

<script>
jQuery(document).ready(function() {
jQuery(“#wlt_shortcode_related”).owlCarousel({ items : <?php echo $perrow; ?>, autoPlay : true, });
});
</script>
<?php

if(isset($wasset)){
$GLOBALS[‘flag-single’] = 1;
}

$odata = ob_get_clean();

return str_replace(“ppt_gal_”,”ppt_gal_related_”,$odata);

}