I discovered it via this:
Which is worth reading through -- the comments are good, too. I've been really lucky. This is the first book I've read on the kindle (and I have hundreds) that had anything like this level of problem. I haven't mentioned it, but _Scorpion Tongues_ also suffers from the italics-not-turning-off and bold-not-turning-off problems described by commenters as occurring in other books.
I suppose I shouldn't be surprised. I remember mass market paperback runs where an entire signature was missing/duplicated. Bad enough in a short story collection, but horrifying in a novel. And there were plenty more books that weren't that obviously unreadable, but had missing and duplicated lines of text. I know this isn't new. It's just a real shock to run into it in something that the publisher thinks I should be paying $10.99 for.