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Almost 100% certain it is the regulator only. Typically, the window won't drop when the door is opened because there is slack in the cable. When you open the top, the slack gets taken up and the windows appear to drop evenly about 2". I'd bete if you measured things really precisely, you'd find the windows don't drop exactly the same amount when the top is unlatched.
As others have suggested, there are two options. One is replace the regulator. The other is to brake cable adjustment.
Good luck.
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