Mung beans give more protein when cooked? But how?

Ok, so there's this website that says 1 cup of cooked mung beans can give about 14g of protein, but when raw, It can only give about 3g of Protein? You get like 80% less nutrients if it's raw. How exactly does that work? Where does the extra protein come from if you cook it?

Source: draxe.com/mung-beans-nutrition/

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