Yeah, it's weird. This is the first book I've gotten from Amazon that's ever had anything wrong with it. I thought about sending it back, but it's only a tiny section and I really don't want to wait to send it back in and wait for a new copy to arrive.
And I've seen hardcovers at bookstores with the tops or sides of the pages all screwed up like this, except in those cases it was actually through the whole book. I always wondered what caused that.