I often see this when going to GH. Not sure if it's just GH or the forum system, but I seem to remember another forum also going a bit mumbo jumbo on me. Don't have too much info on it as I don't go to a lot of forums.
This only happens on my desktop, haven't seen this on the laptop, at least not yet.
Opera on 64-bit W7.
Also, a smaller less annoying problem;
Facebook's mobile site looks different on Opera Mobile than it does on Android's own internet browser now, but at first it looked the same on both. Is this Opera's doing or did Facebook do a couple of changes when they removed the touch site?