Reading amnesia

Not too long ago, I borrowed a book from the library because the description sounded interesting. I started reading it, and about thirty pages in, I ran across a scene that seemed familiar. I couldn't remember if it just resembled a scene in another book I'd read or if I had in fact already read this book. Fortunately, I've been recording all of the books I've read the last few years on Goodreads, and when I looked it up, it turned out that I had read the book already!

This isn't the first tim...