score:1

Accepted answer

You need to define which series belongs to that second xAxis.

  series: [{
      name: 'Foreign men',
    },
    {
      name: 'Swiss men',
    },
    {
      name: 'Foreign women',
            xAxis: 1
    },
    {
      name: 'Swiss women ',
            xAxis: 1
    },
  ],

Demo: https://jsfiddle.net/BlackLabel/rk4bufx7/

API: https://api.highcharts.com/highcharts/series.line.xAxis


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