I have MW wood dual pane windows manufactured in 1994. I have 4 windows that appear crooked at the top. In other words, the top of the sash is not flesh with top blind stop. The "crooked sash" baffles me and my DH. We don't know if the frame is out of square or if the window was installed incorrectly or if the sash is out of square. We have measured the windows left, middle, right side and the measurement is equal. We think the sash is square. If the window frame is out of square, would a replacement window even fix the problem? How can we tell if the frame is out of square or if the window was installed improperly? Do we need to hire someone to take the window out and reinstall it? Perhaps we need to buy a sash kit and it installed with the sashes and have the frame fixed? HELP!!!! Window companies in the DC area just want to install new VINYL windows.