Your cakes will rise in the oven as they bake, but after you remove them and cool they will deflate and fall a little in the middle. But do not worry - this is normal! As the cake cools, the air bubbles that have been whipped in the batter contract causing the cake to fall slightly. There is also no gluten or leavening agents in this cake to help the rise. But this is one purpose, and results in a rich, thick, and fudgy-like cake after!