Parent page not working

Hi there,
This plugin doesn’t seem to be working correctly for me.

In the parent page:
https://www.selwoodhousing.com/knowledgebase/
code is being generated (#kbe_container, #kbe_content, etc), but displaying nothing. The child pages seem to be working ok:
https://www.selwoodhousing.com/knowledgebase/users/

I have no archive.php file in my theme, but there is a standard page.php and the fact that some code is being generated is making me think it’s all good and should be working…

Any help will be greatly appreciated.
Thanks,
Karl

The page I need help with: [log in to see the link]