Fredrick Franz did notice the discrepancy, so in a footnote to the "Revelation"-book
There was much debate as to how involved the (then) 95 year old Franz had in writing the book.
Although pretty senile by then , it is possible that Franz did have some input - notably after he died , the Climax book was substantially revised (we all remember the long list of changes to the book before it was studied for a third time.) His superb expertise in numerous languages , such as biblical Greek , would doubtless have been helpful to the writing committee.