It's not uncommon to see some change in size and shape over time when it comes to the part in question. Remember, some expansion and contraction must be allowed for with changes in temperature and humidity. As the piece ages it loses some elasticity until eventually it doesn't fit properly anymore. R129 soft-tops are a good example as are door glass seals on any of the MB coupes, which have no metal frame around the window. I doubt your car is twisted as you suspect. Perhaps a bit of "fettling" is all thats needed.