I found this bug testing at KY3, first time I personally had seen it. I thought it might be because the rear tire is larger, but once I saw the way it transformed the nose of the car, I think this might be a glitch. This video sums it up pretty well. BTW, it was in hotlap mode.
http://youtube.com/watch?v=FwH1ys1i6gI
http://youtube.com/watch?v=FwH1ys1i6gI