I had a look and compared the default template to the pirates template
There is a slight modification I did which may have caused that...
To fix it, please open up Display.template.php file of the pirates theme and find:
// Show the member's primary group (like 'Administrator') if they have one.
if (isset($message['member']['group']) && $message['member']['group'] != '')
echo '
', $message['member']['group'], '<br />';
// Show the post group if and only if they have no other group or the option is on, and they are in a post group.
if ((empty($settings['hide_post_group']) || $message['member']['group'] == '') && $message['member']['post_group'] != '')
echo '
', $message['member']['group_stars'], '<br />';
echo '
', $message['member']['post_group'], '<br />';
Replace it with:
// Show the member's primary group (like 'Administrator') if they have one.
if (isset($message['member']['group']) && $message['member']['group'] != '')
echo '
', $message['member']['group'], '<br />';
// Show the post group if and only if they have no other group or the option is on, and they are in a post group.
if ((empty($settings['hide_post_group']) || $message['member']['group'] == '') && $message['member']['post_group'] != '')
echo '
', $message['member']['post_group'], '<br />';
echo '
', $message['member']['group_stars'], '<br />';