erm.. private member messages appearing in site-wide category listing page?! (1.8.13)

i just opened mysite.com/categories/list/

and i am seeing, among the cateogrised items, some site notification messages to a particular member appearing too.. !?
e.g. the categorised items list goes:

video
blog
photo
blog
video
message (to:siteuser .. ura created a new blog) - including delete button etc.. basically the inbox message view.

--

i have no idea how this is occuring, since the category list page is clearly specifically for categorised items that use the site-wide categories plugin.

$params = array(
'metadata_name' => 'universal_categories',
'metadata_value' => $category,
'types' => $type,
'subtypes' => $subtype,
'owner_guid' => $owner_guid,
'limit' => $limit,
'full_view' => FALSE,
'metadata_case_sensitive' => FALSE,
);
$objects = elgg_list_entities_from_metadata($params);

 

 any thoughts on this?