The Gravity of the Moon Causes the Earth's Rotation

The moon has a gravitational pull on the earth. It deforms the earth's crusts, it bulges. The atmosphere itself is a fluid and sloshes around in a way that also affects the rotation of the earth. So this is not a cause for concern. This is a very small ange. There are billions, maybe trillions, of parameters that you have to take into account in order to understand why things happen the way they do.