Verify that the Ticket Types do not have a promo code. To check this, follow the steps below:
  1. Content > select Events
  2. Select the Event List tab
  3. Find your event and click Edit
  4. Go to step 6. Configure Ticket Types
  5. Click Edit next to one of the ticket types that are not appearing
  6. Check item 7. Promotion Code near the bottom and make sure that it is blank