Fieldset is not properly restricted and shows up blank

Sorry for the confusion.

I have
--Content Type A (allowed child node types: Content Type B)
--Content Type B (also has allowed child node types: Content Type B)

In Content Type A edit pages, I however still see the hierarchy fieldset legend.
However, as per above config, Content Type A should not have a select field for parent node on its node edit pages. It actually doesn't contain the dropdown, but its form legend still remains.

Thanks

please find img attached

array (
'nodehierarchy_old_menu_links' =>
array (
'#type' => 'value',
'#value' => NULL,
),
'nodehierarchy_menu_links' =>
array (
'#tree' => true,
0 =>
array (
'#type' => 'fieldset',
'#title' => 'Parent',
'#tree' => true,
'#prefix' => '
',
'#suffix' => '
',
'pnid' =>
array (
'#type' => 'value',
'#value' => 0,
),
'menu_name' =>
array (
'#type' => 'value',
'#value' => 'secondary-links',
),
'mlid' =>
array (
'#type' => 'value',
'#value' => '3719',
),
'plid' =>
array (
'#type' => 'value',
'#value' => '0',
),
'link_path' =>
array (
'#type' => 'value',
'#value' => 'node/86',
),
'router_path' =>
array (
'#type' => 'value',
'#value' => 'node/%',
),
'link_title' =>
array (
'#type' => 'value',
'#value' => 'parent',
),
'options' =>
array (
'#type' => 'value',
'#value' =>
array (
),
),
'module' =>
array (
'#type' => 'value',
'#value' => 'nodehierarchy',
),
'hidden' =>
array (
'#type' => 'value',
'#value' => '1',
),
'external' =>
array (
'#type' => 'value',
'#value' => '0',
),
'has_children' =>
array (
'#type' => 'value',
'#value' => '0',
),
'expanded' =>
array (
'#type' => 'value',
'#value' => '0',
),
'weight' =>
array (
'#type' => 'value',
'#value' => '0',
),
'depth' =>
array (
'#type' => 'value',
'#value' => '1',
),
'customized' =>
array (
'#type' => 'value',
'#value' => '0',
),
'p1' =>
array (
'#type' => 'value',
'#value' => '3719',
),
'p2' =>
array (
'#type' => 'value',
'#value' => '0',
),
'p3' =>
array (
'#type' => 'value',
'#value' => '0',
),
'p4' =>
array (
'#type' => 'value',
'#value' => '0',
),
'p5' =>
array (
'#type' => 'value',
'#value' => '0',
),
'p6' =>
array (
'#type' => 'value',
'#value' => '0',
),
'p7' =>
array (
'#type' => 'value',
'#value' => '0',
),
'p8' =>
array (
'#type' => 'value',
'#value' => '0',
),
'p9' =>
array (
'#type' => 'value',
'#value' => '0',
),
'updated' =>
array (
'#type' => 'value',
'#value' => '0',
),
'enabled' =>
array (
'#type' => 'value',
'#value' => false,
),
'nid' =>
array (
'#type' => 'value',
'#value' => '86',
),
),
),
'nh_children_view' =>
array (
'#type' => 'value',
'#title' => 'Embed Children View',
'#multiple' => false,
'#options' =>
array (
0 => '-- NONE --',
'nodehierarchy_children_teasers:default' => 'nodehierarchy_children_teasers: Defaults',
'nodehierarchy_children_list:default' => 'nodehierarchy_children_list: Defaults',
),
'#required' => false,
'#default_value' => NULL,
'#description' => 'Embed a view containing this node\'s children into the node\'s page view',
),
)

I changed the display value because my users have no clue what a NODE is.
I hope that is not an/the issue
:/

I changed it back to the orig and the issue persists.

FYI...I had only changed this line and nothing else:

'#title' => t('Hierarchy'),

from this block of code...

if ($hierarchy_form) {
$weight = function_exists('content_extra_field_weight') ? content_extra_field_weight($type, 'nodehierarchy') : 10;
$form['nodehierarchy'] = array_merge(
array(
'#type' => 'fieldset',
'#title' => t('Hierarchy'),
'#collapsible' => TRUE,
'#collapsed' => empty($form_state['nodehierarchy_expanded']) ? TRUE : FALSE,
'#weight' => $weight,
'#access' => $access,
),
$hierarchy_form);

I actually tried to hide it via my CSS so that I wouldn't have to fork the module which I really don't want to do except for some reason the divs surrounding it have no NH specific ids or classes that I can use to set display: none.

Sorry for my ignorance but in which file would I insert the code you have provided above?
Thanks again for your help on this.

says that function is already called:
I am using my own version of Zen theme and I do not know much programming but I do see that it is already called here...

/**
* Implementation of HOOK_theme().
*/
function gb_theme_theme(&$existing, $type, $theme, $path) {
$hooks = zen_theme($existing, $type, $theme, $path);
// Add your theme hooks like this:
/*
$hooks['hook_name_here'] = array( // Details go here );
*/
// @TODO: Needs detailed comments. Patches welcome!
return $hooks;
}

hmm, I updated, cleared cached and it didn't remove anything. It just moved my Submit and Preview buttons to the top of the form on the page :\

Yep, I set it to the machine name and the update of the legend didn't work either.