Gauge not showing percentage correctly

Grafana Gauge Panel
1

Hi,

I have a gauge which measures how much percentage memory is used in a cluster.
However the bar for for example 60% is less far then 10%?

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So what am I doing wrong? JSON panel:

{
  "datasource": {
    "type": "prometheus",
   "uid": "thanos"
  },
  "fieldConfig": {
    "defaults": {
      "mappings": [],
      "thresholds": {
        "mode": "percentage",
        "steps": [
          {
            "color": "green",
            "value": null
          },
          {
            "value": 80,
            "color": "#EAB839"
          },
          {
            "value": 90,
            "color": "semi-dark-red"
          }
        ]
      },
      "custom": {
        "neutral": 0
      },
      "unit": "percent"
    },
    "overrides": []
  },
  "gridPos": {
    "h": 7,
    "w": 4.8,
    "x": 0,
    "y": 8
  },
  "id": 14,
  "links": [
    {
      "targetBlank": true,
      "title": "x",
      "url": "X"
    }
  ],
  "maxPerRow": 12,
  "options": {
    "reduceOptions": {
      "values": false,
      "calcs": [
        "mean"
      ],
      "fields": ""
    },
    "orientation": "auto",
    "showThresholdLabels": false,
    "showThresholdMarkers": true
  },
  "pluginVersion": "9.5.1",
  "repeat": "cluster",
  "repeatDirection": "h",
  "targets": [
    {
      "datasource": {
        "type": "prometheus",
        "uid": "thanos"
      },
      "editorMode": "code",
      "expr": "(sum(node_memory_MemTotal_bytes{cluster=~\"$cluster\",hostname=~\"$hostname\",namespace=\"monitoring\"} - node_memory_MemFree_bytes{cluster=~\"$cluster\",hostname=~\"$hostname\",namespace=\"monitoring\"} - (node_memory_Cached_bytes{cluster=~\"$cluster\",hostname=~\"$hostname\",namespace=\"monitoring\"} + node_memory_Buffers_bytes{cluster=~\"$cluster\",hostname=~\"$hostname\",namespace=\"monitoring\"} + node_memory_SReclaimable_bytes{cluster=~\"$cluster\",hostname=~\"$hostname\",namespace=\"monitoring\"}))) / (sum(node_memory_MemTotal_bytes{cluster=~\"$cluster\",hostname=~\"$hostname\",namespace=\"monitoring\"})) * 100",
      "legendFormat": "__auto",
      "range": true,
      "refId": "A"
    }
  ],
  "title": "Memory $cluster",
  "type": "gauge",
  "scopedVars": {
    "cluster": {
      "text": "cak91001",
      "value": "cak91001",
      "selected": true
    }
  }
}
2

Problem solved, I needed to enter a min and max value, this fixed it.