Cakes that hump in the middle

A rounded, peaked top cake crust is most commonly caused by an oven that's too hot. Use an oven thermometer- available at the bake ware section of good department store- to check how accurate you oven temperature is. Also, over mixing the cake batter makes it too firm when it sets, so the uncooked centre can only expand upwards during baking, forming a hump: Don't over beat your batter after adding the flour.