If Event Price Options are missing when viewing the event
If Event Price Options are missing when editing the event registration form part

Remove the Event from the Event Registration Form and re-add the Event.  This will allow to push this information over from The Raiser's Edge:
  1. Edit the event registration form part
  2. On the Design Tab, under Add events, click the Remove link under Actions for the Event not showing correct Event price options.
  3. Click the Add an event button at the bottom of the Add events section.
  4. Search for the same Event and click Select.
  5. Click Edit under Actions for this Event under Add events.
You should now see the updated Event price options on the Event configuration screen.

Additional Resources
How to sort pricing options on an Event Registration Form
Error: You must include at least one price for [EVENT NAME] - when creating an event registration form page
What changes to the Prices tab in The Raisers Edge automatically update the prices on an Event Registration form in Blackbaud NetCommunity?