This is normal! Pound cakes will almost always crack on the top. As you will see from the photos, there is always a distinct crack down the middle of the baked cake.   When the cake is in the oven, the outside of the cake cooks first, and this makes the batter rise up in the middle. It's a characteristic of a good pound cake.  Some people don't like seeing the crack, so if that's you, feel free to cover the crack with a drizzle of frosting, or in you wanted to bake using a bundt pan instead of a loaf pan, when the cake is turned out, the cracks will be underneath the bundt cake.