OMG you are awesome. THANK you.. that was exactly the answer. For anyone else interested, just comment out the lines below in your archive.php file.
<?php /* If this is a category archive */ if (is_category()) { ?>
<h1 class="pagetitle"><?php printf(__( 'Posts from the ‘%s’ Category', 'linen' ), single_cat_title('', false)); ?></h1>
