Are the amounts on the website broken or am I slightly dense? The "Overnight Weekend Bread" recipe (http://www.breadscheduler.com/#/recipe/5bac85f720211052e0b70

Are the amounts on the website broken or am I slightly dense? The "Overnight Weekend Bread" recipe (http://www.breadscheduler.com/#/recipe/5bac85f720211052e0b703f1 http://www.breadscheduler.com/#/recipe/5bac85f720211052e0b70...) instructs you to create 500g-550g of levain (the amounts in the overview and the step-by-step instructions don't quite match for me). Then, in the "Mix Dough" step it tells you to use 108g of the levain. What happens to the rest? Are you supposed to throw it out or keep it as your sourdough starter? Also, the "Autolyse" step tells you to use 402g of white flour while the overview specifies 804g. (Judging by the hydration they must certainly mean 402g).