Littlejo, it would also help us help you if you posted your original height and weight, if you don't mind, and a bit more info about you before you started the diet, for instance had you been using another diet. Ie WW or SW?
It all sounds a bit odd but we'll get to the bottom of it!
I wouldn't worry about the ketostix, I chucked them away in the end, mine never registered purple, just a pinky colour and I've lost every week.....they're totally unreliable! X