Why does dark matter behave differently in small galaxies than in large ones?

The most important characteristic of dark matter is that it interacts only by way of gravity. And as the only one of the four fundamental forces, gravity is always attractive. Therefore, no matter where it occurs, dark matter must always collect at the mass center of the respective structure, regardless of whether it is a small galaxy or a giant galaxy cluster.

But in reality, things look quite different: in galaxy clusters, dark matter exhibits the expected behavior, but in smaller galaxies...