set “gridPos” failed

[triplewz]

Hello, I was trying to set panel with the parameters, but the final panel was not expected because the parameter “gridPos” doesn't work.
The params are as follows:

{
  "colorValue": true,
  "colors": [
    "rgba(50, 172, 45, 0.97)",
    "rgba(237, 129, 40, 0.89)",
    "rgba(245, 54, 54, 0.9)"
  ],
  "datasource": "Prometheus",
  "decimals": 2,
  "editable": true,
  "format": "percent",
  "gauge": {
    "maxValue": 100,
    "minValue": 0,
    "show": true,
    "thresholdLabels": false,
    "thresholdMarkers": true
  },
  "gridPos": {
    "x": 0,
    "y": 0,
    "w": 12,
    "h": 5
  },
  "height": "180px",
  "isNew": true,
  "mappingType": 1,
  "mappingTypes": [
    {
      "name": "value to text",
      "value": 1,
      "$$hashKey": "object:81"
    },
    {
      "name": "range to text",
      "value": 2,
      "$$hashKey": "object:82"
    }
  ],
  "maxDataPoints": 100,
  "nullPointMode": "connected",
  "postfixFontSize": "50%",
  "prefixFontSize": "50%",
  "rangeMaps": [
    {
      "from": "null",
      "text": "N/A",
      "to": "null"
    }
  ],
  "sparkline": {
    "fillColor": "rgba(31, 118, 189, 0.18)",
    "lineColor": "rgb(31, 120, 193)"
  },
  "targets": [
    {
      "expr": "sum(rate(container_cpu_usage_seconds_total{}[$__rate_interval])) by(pod) /(sum(container_spec_cpu_quota{}) by(pod) /100000) * 100",
      "format": "time_series",
      "interval": "10s",
      "intervalFactor": 1,
      "refId": "A",
      "step": 10
    }
  ],
  "thresholds": "65, 90",
  "title": "CPU Utilization",
  "type": "singlestat",
  "valueFontSize": "80%",
  "valueMaps": [
    {
      "op": "=",
      "text": "0",
      "value": "null",
      "$$hashKey": "object:84"
    }
  ],
  "valueName": "current",
  "fieldConfig": {
    "defaults": {},
    "overrides": []
  },
  "links": [],
  "colorBackground": false,
  "error": false,
  "postfix": "",
  "prefix": "",
  "interval": null,
  "cacheTimeout": null,
  "nullText": null,
  "tableColumn": ""
}

The width was expected to 12, but the result was 8.

[triplewz]

So what's wrong with it? Thanks.