why am I getting a tapping sound from my rear brake when I apply the brake on 2002 Nissan Pathfinder

I am getting a "tapping" sound coming from my rear-brake after replacing the Rear Brake Drums and Brake Shoes. I went to another sets of Brake Shoe from another manufacturer and even replaced the Drums a second time.

Asked by for the 2002 Nissan Pathfinder