this may be weird....but double check that all the bolts are TIGHT!
this fixed mine. I would say something that is different from 03 to 05 that would keep yours from popping open but apparently it doesn't work.
I had the same problem and the dealership told me to tighten them. (I really just wanted a new hardtop...
but i tightened them and it worked. Just enough to keep the air pressure getting pushed out by the closing of the doors from pushing the window open and going out the vent in the tailgate.
If this doesnt work...do what i did....crack your window an inch everytime you close your door until you fix the problem. This way, the window won't pop open in the back.