Yeah, mine does that - drains below the wheel well passenger side, iirc. My car was doing something similar, the tank was emptying weekly. It turned out the nozzles to the headlights were faulty and peeing fluid all over the floor. Because they only deploy while driving, there was no fluid on the driveway to say where the leak was coming from. I had both nozzles replaced by audi. It was quite expensive.Took it to garage who looked it over and said there is no issue and its just falling from windscreen to passenger front, but someone I know had one who didn't notice this with theirs. It doesn't seem right to me but could anyone give their views?
The other possibility is that the fill level sensor is reporting badly. Apparently some washer additives can coat the sensor and cause this.