64 cuda door glass installation

The channel for the glass and attached ss divider strip seems awful wide (the channel on the inside latch side of door with the felt on the inside) when the window is partially rolled down or all the way down it is fine but when it is rolled all the way up there seems to be way too much play in the glass. It wants to wobble back and forth about 3/4 inch ( back and forth in the direction of inside to outside of vehicle) When the door is slammed shut I am concerned about eventual damage. Any one have that problem ?