Follow these steps:

  1. Close Final Cut Pro X
  2. Open Font Book;
  3. Go to the edit menu and select "Look for Enabled Duplicates" or press cmd L;
  4. Click Resolve Manually
  5. Check the box Resolve duplicates by moving duplicate font files to the trash;
  6. Click Resolve All Duplicates and click ok;
  7. Close Font Book and Open Final Cut Pro X again.

This process should solve this issue.

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