Filter paramereters are not respected, Update old template file to use the new form

Edit category_items(_html5).php and find the old <form>  ... </form>
e.g.

<?php if ((($this->params->get('use_filters', 0)) && $this->filters) || ($this->params->get('use_search')) || ($this->params->get('show_alpha', 1))) : ?>
<form action="<?php echo $this->action; ?>" method="post" id="adminForm">.
...
</form>
<?php endif; ?>

Replace the above with the new form:

<?php
	ob_start();
	
	// Form for (a) Text search, Field Filters, Alpha-Index, Items Total Statistics, Selectors(e.g. per page, orderby)
	// If customizing via CSS rules or JS scripts is not enough, then please copy the following file here to customize the HTML too
	include(JPATH_SITE.DS.'components'.DS.'com_flexicontent'.DS.'tmpl_common'.DS.'listings_filter_form_html5.php');
	
	$filter_form_html = trim(ob_get_contents());
	ob_end_clean();
	if ( $filter_form_html ) {
		echo '<aside class="group">'."\n".$filter_form_html."\n".'</aside>';
	}
?>