score:1

Accepted answer

That issue is related with dataGrouping. As a solution you can set groupAll to true:

series: [{
    dataGrouping: {
        groupAll: true
    },
    ...
}]

Live demo: http://jsfiddle.net/BlackLabel/9gs8ukye/

API Reference: https://api.highcharts.com/highstock/series.line.dataGrouping.groupAll


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