Accepted answer

This is happening probably because of series dataGrouping. It is the concept of sampling the data values into larger blocks in order to ease readability and increase performance.

So the solution could be to disable it or change the approximation method so that it shows not group average but one of its points (so that it will be 0 or 1).

  plotOptions: {
    series: {
      dataGrouping: {
        enabled: false

API reference:

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