Wiki plugin not working correctly

Hi guys,

The plugin i installed is not working correctly.
Here are some issues i experienced:
1) wikis hierarchy is not showing in the admin - all wikis are equal although they have been set as child to one of them
2) wiki page not showing anything below the html. As far as i can see in the screenshots it should include sub wikis and notification. What i can see is the admin tabs and html only.
3) widget is not including the hierarchy - it shows all the wikis in random order

Please, help!