Heh, the recording was very weird for some reason and I noticed too late!
Didn't think I'd make it that far :)
Really.. I don't understand the reason, which capture program you're using?
Fraps, which captures OpenGL (or equivalent?) directly. Perhaps the game has a frame and only in the center it was OpenGL context, so that it was displaced by Fraps, which for some reason still used the resolution of the whole window.
Would have used OBS if I had known. :)
Try to record the full monitor image instead the game application.
PS. I used the Open Broadcaster Software in gameplay video of the top of this page.