[Docker] "Unknown port" from second docker instance

Hello,

I am running two docker containers for dev and prod, from docker-compose:

version: "3.6"
services:
  azure-metrics-exporter_dev:
    image: robustperception/azure_metrics_exporter
    network_mode: host
    restart: always
    command:
    - '--config.file=/config/dev.yaml'
    volumes:
    - "/azure-metrics-exporter/config:/config:rw"
  azure-metrics-exporter_prod:
    image: robustperception/azure_metrics_exporter
    network_mode: host
    restart: always
    command:
    - '--config.file=/config/prod.yaml'
    - '--web.listen-address=":9275"'
volumes:
    - "/azure-metrics-exporter/config:/config:rw"

Metrics looks good from dev in localhost:9276/metrics , but second docker is restarting all the time. Docker logs output:

azure-metrics-exporter# docker logs b9d7asdecbd0
2021/04/01 10:31:25 azure_metrics_exporter listening on port ":9275"
2021/04/01 10:31:25 Error starting HTTP server: listen tcp: address tcp/9275": unknown port

It looks that is not able to read port. But in docker-compose.yaml I am using command:
- '--web.listen-address=":9275"'

Tested with separated config and SPNs for subscription