Custom Taxonomy heading

hi guys,

My site is set out to have a portfolio section,

each portfolio item needs to correspond to a custom product category which contains a product we offer.

currently i am using an archive of each product to display the products name and the products description, which i had working fine, however my client pointed out once testing this feature that if a portfolio item is assigned to more then one of the product categories the archive page displays both of the headings and both of the descriptions.

the loop works fine because i want all the posts even the ones shared with other products to be displayed however using the following code it get the other products category displayed as well

<h2><?php
$terms = get_the_terms( $post->ID, 'work_type' );

if ( $terms && ! is_wp_error( $terms ) ) : 

	$tax_header = array();

	foreach ( $terms as $term ) {
		$tax_header[] = $term->name;
	}

	$out_tax_header = join( ", ", $tax_header );
?>
<?php echo $out_tax_header; ?>
<?php endif; ?></h2>
					<?php
$terms = get_the_terms( $post->ID, 'work_type' );

if ( $terms && ! is_wp_error( $terms ) ) : 

	$tax_descr = array();

	foreach ( $terms as $term ) {
		$tax_descr[] = $term->description;
	}

	$out_tax_descr = join( ", ", $tax_descr );
					?><p><?php echo $out_tax_descr; ?></p>
  <?php endif; ?>

i then found out that the second category when archived does not display any information from the first one . you can see this here – basically i want to show the correct posts but so far nothing is working