For example, if I do:

$ sudo ./bin/config get diffusion.ssh-user
{

"config": [
  {
    "key": "diffusion.ssh-user",
    "source": "local",
    "value": "git",
    "status": "set",
    "errorInfo": null
  },
  {
    "key": "diffusion.ssh-user",
    "source": "database",
    "value": null,
    "status": "unset",
    "errorInfo": null
  }
]

}

What's the difference between these, why should I care and should both be the same?