AWS MediaConverter possible big with Video scaling

HI

i am using MediaConverter to crop and output videos i would like the output video to have no padding so always stretch to fit , ignoring aspect ratio my input video looks like this (single frame) 1920x1080

with a crop of setting of

"Crop": {
                "Height": 540,
                "Width": 1920,
                "X": 0,
                "Y": 0
              }

and scaling behavior of

"ScalingBehavior": "STRETCH_TO_OUTPUT",

i would expect the output to be

except it comes out like

does anyone know what the issue could be?

below is the full job json (with account details removed)

{
  "Queue": "arn:aws:mediaconvert:ap-southeast-2:******:queues/Default",
  "UserMetadata": {},
  "Role": "arn:aws:iam::*********:role/service-role/MediaConvert_Default_Role",
  "Settings": {
    "TimecodeConfig": {
      "Source": "ZEROBASED"
    },
    "OutputGroups": [
      {
        "Name": "File Group",
        "Outputs": [
          {
            "ContainerSettings": {
              "Container": "MP4",
              "Mp4Settings": {}
            },
            "VideoDescription": {
              "Width": 1920,
              "ScalingBehavior": "STRETCH_TO_OUTPUT",
              "Crop": {
                "Height": 540,
                "Width": 1920,
                "X": 0,
                "Y": 0
              },
              "Height": 1080,
              "CodecSettings": {
                "Codec": "H_264",
                "H264Settings": {
                  "Bitrate": 15000000,
                  "RateControlMode": "CBR",
                  "QualityTuningLevel": "SINGLE_PASS_HQ"
                }
              }
            },
            "NameModifier": "stretchWidth"
          }
        ],
        "OutputGroupSettings": {
          "Type": "FILE_GROUP_SETTINGS",
          "FileGroupSettings": {
            "Destination": "s3://******/"
          }
        }
      },
      {
        "Name": "File Group",
        "Outputs": [
          {
            "ContainerSettings": {
              "Container": "MP4",
              "Mp4Settings": {}
            },
            "VideoDescription": {
              "Width": 1920,
              "ScalingBehavior": "STRETCH_TO_OUTPUT",
              "Crop": {
                "Height": 1080,
                "Width": 960,
                "X": 0,
                "Y": 0
              },
              "Height": 1080,
              "CodecSettings": {
                "Codec": "H_264",
                "H264Settings": {
                  "Bitrate": 15000000,
                  "RateControlMode": "CBR"
                }
              }
            },
            "NameModifier": "stretchHeight"
          }
        ],
        "OutputGroupSettings": {
          "Type": "FILE_GROUP_SETTINGS",
          "FileGroupSettings": {
            "Destination": "s3://******/"
          }
        }
      }
    ],
    "FollowSource": 1,
    "Inputs": [
      {
        "VideoSelector": {},
        "TimecodeSource": "ZEROBASED",
        "FileInput": "s3://******.mp4"
      }
    ]
  },
  "BillingTagsSource": "JOB",
  "AccelerationSettings": {
    "Mode": "DISABLED"
  },
  "StatusUpdateInterval": "SECONDS_60",
  "Priority": 0
}