well there you go then missus!
I suggest a) dont weigh on the wii fit and b) throw your other scales away
I dont know what scales you are using but if you can, get a good pair. I bought the Salter glass digital scales in Argos at a very reasonable price and they seem to work fine. Sometimes scales can stop working for some reason. And the fact your scales showed no loss and you had a weight loss in your pharmacy would suggest something wrong with your scales.
Buy them, put them in one place and only weigh in every morning about half an hour after your first wee and in the nuddy pants.
You are seeing results though if your clothes are getting better on you...you must be losing inches! Have you measured yourself? Im going to measure myself every 2 weeks or so for further thinspiration.
Keep at it babes, if you are having the 3 shakes, drinking the water and nothing else then you will see a loss.