BindingError

When I say 'binding error' I do not mean binding in the sense of binding things together in the story. I mean our copy (paperback version of Words of Radiance, Book Two of The Stormlight Archive) has a binding error.. It goes from page 1 - 646, then starts over at page 1 - 646 for a second go through. The first half is a good read, but not SO good... Anyone have a similar problem with their book binding? Thanks, Dave