Wierd weight loss

I have been doing a shake diet for a couple months now and its fantastic but i seem to be losing weight quite strangely. I will go for a couple weeks without losing any weight then all of a sudden will lose 2-3kg within a couple days, then nothing again for a couple weeks. I was wondering if this is normal? i have never lost weight like this before it has always been a steady .5 - 1 kg every week? All up i have lost 10 kgs

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