Help with List project pipelines

I am doing a request to: GET /projects/:id/triggers in GitLab CI and I am receiving an incomplete token as response, only the first four digits at some requests.

As this example:

        "id": 10,
        "description": "my trigger",
        "created_at": "2016-01-07T09:53:58.235Z",
        "last_used": null,
        "token": "6d05",
        "updated_at": "2016-01-07T09:53:58.235Z",
        "owner": null

when the token is: 6d056f63e50fe6f8c5f8f4aa10edb7, does anyone knows something about this? Is happens only in some projects