When I stopped drinking coffee I also had to stop having carbs for lunch not to fall asleep in the office. I only had a bowl of salad instead. It seems to be a virtuous routine but I gained weight anyway, as for some reason coffee was reducing my overall appetite.
You were/are still overeating in the sense that you are taking in and storing more calories because you are outpacing the rate at which you deplete them. Eat less, or expend more calories.