Were only fourteen Castle-class corvettes completed?
Short answerThe class history lists 39 entries across British, Canadian, and Norwegian service; the apparent fourteen-ship total came from overlooking additional tables.
NotesThe class history contains 39 entries with HMS, HMCS and HNoMS prefixes, rather than the fourteen ships suggested in the question. The entries span Royal Navy, Royal Canadian Navy and Royal Norwegian Navy service. The viewer then notices additional tables on the reference page they had consulted. The discrepancy comes from treating one table as the complete list.