Problem with point clustering not working

CesiumJS
1

I’m trying to make a clustering of points with label , but my points always stay clustered and I can’t figure out why.
The points before clustering :

2
2937×670 18.9 KB

With clustering :
1
1917×661 5.44 KB

But with only labels it works fine :
3
3903×781 14.3 KB

here is my entity creation code :

   const dataSource = new CustomDataSource('elementData');

 const pixelRange = 15;
    const minimumClusterSize = 2;
    const enabled = true;

    dataSource.clustering.enabled = enabled;
    dataSource.clustering.pixelRange = pixelRange;
    dataSource.clustering.minimumClusterSize = minimumClusterSize;

        dataSource.entities.add({
          id: id,
          position: Cartesian3.fromDegrees(lon, lat, 0),
          point: {
            pixelSize: 8 ,
            color: Color.RED,
            outlineColor: Color.BLACK,
            outlineWidth: 1,
          },
          label: {
            text: name,
            font: '14px sans-serif',
            style: LabelStyle.FILL,
            fillColor: Color.BLACK,
            pixelOffset: new Cartesian2(0, -9),
          },
        });
      }