Wikipedia In German

[Fnarf]

I'm reading this Kindle book Los Angeles in the 1970s: Weird Scenes Inside the Goldmine, edited by David Kukoff and Jeremy Rosenberg, on the Kindle app on my Samsung Note 5, as usual, when I notice something odd: when I select something, the Wikipedia link that comes up is in German. When I click on "Go to Wikipedia" it takes me to the de.m.wikipedia link, not the en.m.wikipedia one. I thought I might have accidentally whacked a setting somewhere, but I checked, and in other books it still comes up with the English Wikipedia. So this must be something special about this specific book.

Why, though? Why would a book written in English and published in the United States, downloaded from the US Amazon, have German Wikipedia assigned to it? It's kind of annoying. Not as annoying as X-Ray, which this book fortunately doesn't have, but still.

Any ideas?