Docker-compose stop does not stop all containers

I have a test rails 5.2.2 app running in docker and reports no errors in console but when I run docker-compose stop there is 1 container which doesn’t stop. My o/s is macos running Docker for Mac. The container which doesn’t stop is db_data.

docker-compose up will restart the stopped container and the app continues to run normally.

Here is my docker-compose file

version: '3' services:   postgres:     image: postgres     env_file:     - '.env'     environment:     - PGDATA=/var/lib/postgresql/data           db_data:     image: postgres     volumes:     - /var/lib/postgresql/data     command: /bin/true   redis:     image: redis     ports:     - "6379:6379"   web:     build: .     command: "bin/bundle exec rails s -p 3000 -b 0.0.0.0"     depends_on:     - redis     - postgres     env_file:     - '.env'     environment:     - RAILS_ENV=development     - REDIS_URL=redis     - REDIS_PORT=6379     volumes:     - .:/usr/src/app     - gem_cache:/gems     ports:     - "3000:3000"     environment:     - WEBPACKER_DEV_SERVER_HOST=webpack_dev_server   webpack_dev_server:     build: .     command: ./bin/webpack-dev-server     ports:     - "3035:3035"     env_file:     - '.env'     environment:     - RAILS_ENV=development     - REDIS_URL=redis     - REDIS_PORT=6379     - WEBPACKER_DEV_SERVER_HOST=0.0.0.0     volumes:     - .:/usr/src/app     - gem_cache:/gems  volumes:   gem_cache: