That's because the folks at gamestop decided they couldn't have something with the word "wish" in it without being able to crush it. Did you know they sell gutted games as new!?
But yeah, the same thing happened to me, along with my order history... I can rebuild the wishlist no prob but hopefully my orders aren't going to be screwed up or anything... I have quite a few preorders plus a long-backordered game BIF w/ store credit, definitely don't want those to get screwed-up.