Check the water inlet spout. This is the part that the water spays through just before it enters the tub. It should be mounted to the back of the washer. Sometimes one side or both sides come undone and then the water hits the top of the washer.
Sometimes the water inlet spout gets hard water deposits built up in it and the water ends up dripping out of the corners of it as the washer fills. The drops from the corner get the top of the tub wet and it splashes around from there.