To determine the issue you are having, follow the steps below to confirm whether your TeamRaiser is using a Responsive format or a Standard format.
  1. Navigation to Fundraising > select TeamRaiser
  2. Find your TeamRaiser and click Edit
  3. Navigate to step Customize Pages
  4. Click Configure next to the page you were on that cannot display the nav bar
  5. At the top next to Layout is where you should see Standard or Responsive
The navigation bar was created before responsive layouts were made available to TeamRaiser. It was never updated to be compatible in responsive layouts, which is why it does not appear. You'll need to rely on custom styling for responsive navigation bars.