I'm wanting to make a 180ml bottle, so putting 6 level scoops of formula in the bottle, selecting 180ml on the machine, it adds the hot shot, I'm shaking it up and putting it back for the cool water, but it isn't stopping anywhere near 180! It just seems to keep going til I panic and stop it! I guess the formula itself adds some volume but not all that much! What the heck? Am I doing it wrong or is it a dodgy machine or what? I don't have a manual and looking online I can only find info about the American version with the twisty dial.