Default Facebook messenger camera sideways

I've been having problems lately with the facebook app installed on my Tf300T, the in-app camera is turned 90 sideways, both in portrait and landscape. This is the only app that gives me troubles, as the stock camera and other camera apps work just fine. Anyway, i can't seem to find anything on the internet concerning this problem; perhaps it only happens on this particular device? Because my brother has the exact same tablet and the same thing happens to him. Any suggestion on how to fix it?