Changes you make to Property Type or Amenities directly in WordPress are replaced after the next sync with Guesty.
Why this happens. Your website mirrors Guesty on every sync, so synced fields such as Property Type and Amenities are overwritten with the Guesty data.
What you can do. To make changes that survive syncing, use Guesty custom fields instead of editing in WordPress. Custom fields travel with the sync rather than being overwritten by it.