Sometimes when I am mixing bread dough in a stand mixer, the bread dough separates into two or more lumps. Today, for example, I was making brioche, I mixed in the cold water and eggs into the flour mixture and I get two separate lumps of dough. Kneading was impossible since one lump of dough stuck to the hook and the other lump kept getting pushed up, out of the mixer bowl. I tried to remedy this situation by kneading them by hand for a while before tossing it back into the mixer, sometimes this work, today it didn’t. What did I do wrong?