Roy, you are correct. The old USA glass was 1/4. The Chinese glass is 6 MM. (.236 with tolerance). It's not the glass thickness that is your problem. I suspect the distance across the opening/across the run channels is "squeezing" the glass too tight. You have to be sure the channels are tightly "seated" against the division bar and the door on the other side. You have to study your installation of those run channels. Also those rivets everyone is talking about could maybe stick out on the side window side and cause the run channel to squeeze side window.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn