I am testing out the Drupal 8 core Forum module. I am using a theme that I based off of Acquia Lightning. I have successfully installed the module and added Containers, Forums and Topics. My issue is that the Topics I create don't seem to get associated with the Forum taxonomy. In other words, when I go to /forum I see my containers and forums but every forum has Topics: 0, Posts: 0, Last Post: n/a.
I have tried clearing cache, running cron, looking at the watchdog logs but nothing seems to indicate why it isn't working. I am not receiving any memory errors, white screen of death, etc. All other site functions seem to work properly: I can save content and taxonomies, create new views, assign blocks, etc.
See the attached screen grab. I could use some ideas on what might be causing this. Any assistance would be greatly appreciated.