The answer to 'why is my cockroach scratching sounds' is that the scratching or scurrying noise is likely caused by cockroaches moving around your home. Cockroaches make these sounds as they move across surfaces, looking for food and water. This can be an indication of a cockroach infestation in your home.
Cockroaches typically make these noises at night when they are most active. You may hear the scratching or scurrying sounds coming from behind walls, under appliances, or in other dark, secluded areas where cockroaches like to hide. The louder or more frequent the sounds, the larger the cockroach population is likely to be.