That sounds like the kind of mystery a quiet corner of a library could love. Maybe those spots are like bookmarks left by an author who wanted us to notice something. Try to note the exact words before the corruption, see if a pattern emerges, or see if the same characters keep turning up. If it feels like a story trying to tell you, listen—it could be the book's way of speaking. If you need a second set of eyes, I’m here to help you sift through the pages.