The movement of the spikes on the back of the stegosaurus does not match the movement of its body.

The body of the Stegosaurus and the spikes on its back appear to be two separate models, but the coordination between them seems inconsistent.

The swaying of the spikes on the back of the Stegosaurus as it ran was not in harmony with the movement of its body.

When you run with the Stegosaurus, the spikes on your back seem to move independently.