Accepted answer

The problem is in dataGrouping, when disabled works fine:

DataGrouping is method in Highcharts to approximate points and display them when width of the chart is not enough, e.g. how to display 10 000points in a chart of width 1 000px -> 10 points in a one pixel..? And when dataGrouping is used, new points are created, so all your custom options like 'names' etc. are lost (at least not accessible).


    plotOptions: {
        line: {
            dataGrouping: {
                enabled: false
            turboThreshold: 10000

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