Strange Anonymous/Authenticated Behaviour

Strange problem with Menu First Child:
When viewing the site while logged in - everything works as expected. When viewing the site while not logged in, all menu titles using are set as 'Login'. The strange thing is - the links work as they should and title tags inside are ok. Only the text inside get's affected.

My configuration is a bit special, as I use "Dutch" as the site langugage but "English" for the admin part (with the help of Admin Language Module). However disabling this module doesn't fix the problem.

The only way I found to fix this is to add:
$item['title'] = $item['link_title'];
to function menu_firstchild_translated_menu_link_alter(&$item, $map)
(after line 50 in menu_firstchild.module)

Any ideas why is it behaving like this?