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How did you add pages?
Did you add them at the end, at the beginning, in the middle of the book ... or, perhaps, just as a 'total page count' that was increased by accident?
Also, what editor are you working in, on your iMac? is it an online service like Amazon Kindle Self Publishing? or is it local to your iMac?
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Please tell me: an 'Apple book' is prepared with what software, or program, on your computer ?
If you have saved the book to disk already, I might go to 'total number of pages' as a setting, while your book is loaded, and reduce that from 92 to 64, and see what the result looks like, and glance through pages to make sure none (or any vital importance) are now missing, then save that (if it looks OK) to a different file name, in case some vital difference with the original was introduced that might turn up later.
(Admittedly I don't know where the 'total number of pages' setting would be, since I don't yet know what software you are preparing or editing or creating the book in.)