Irritating power window problem

I have a 94 GT convert with an odd problem. When you roll the front and rear drivers side window, they don't line up and the front window overlaps the back by atleast 1/2". Has anyone here ever have that problem I'm not sure if its the back or front thats the problem. I have to drop the back window a little to make them line up. Then it starts leaking in at the top. Any help would be great. :bang: