This is obviously a very embarrasing mistake that we really should have caught in proofing. A large number of people have checked this map multiple times and strangely, none of us caught it. All I can say is that it is not indicative of the proofing of the book as a whole.
These things happen. Though to maybe to offer a point for the future, perhaps it would have been a good idea to release the pdf's to us before you sent the whole thing to the printers. In less than half a day we've spotted around 3 typo's/errors within the game. There's some 110 play testers and contributors in the front of the book, it was very clear we were happy to help make this as stellar a product as possible, holding back the pdf from the people who have already gladly preordered to support this dream doesn't really serve much of a purpose.
On a positive note though the book is otherwise exceptional and I can't stress how well the artwork wraps the entire thing together. Best alien rpg to date and dare I say my now favorite free league rpg.