GraphicsMagick using nodejs not returning correct image

I am using GraphicsMagick.

This is the image:

http://ift.tt/1FrCsXu

which I used for cropping:

My code is here:

 gm(request(url), "myimage.jpeg")
    .resize(270, 270, '^')
    .gravity('Center')
    .quality(50)
    .crop(270,270)
    .compress('JPEG')
    .flatten()
    .stream(function (err, stdout, stderr) {
            if (err)
                console.log(err);
            else {
                //upload the file
                file.uploadFileFromGm(fileDetails, stdout, cb);
            }
        });

The code is working fine.

But I got an transparent image which is empty on left side.

I got the following image as a result:

Why is white background not working in the transparent portion? Any idea how to resolve this?