I bought the game today, and three cards had this yellow streak across them. I have an email in to FFG about replacing them, I hope they do, but I suppose a few uglier than usual (is that possible? lol) Genestealers won't hurt, much . . . heh.
That's definitely a printing error. FFG should (and probably will) replace them. That's actually the first report of a PoD expansion having such problems that I've seen. Let us know how you go with getting them replaced.