score:0

Accepted answer

some of the data labels are hidden because they are too close to each other and overlap. to show all of them set:

datalabels: {
  allowoverlap: true,
  ...
}

live demo: http://jsfiddle.net/blacklabel/6m4e8x0y/4967/

api reference: https://api.highcharts.com/highcharts/series.sankey.datalabels.allowoverlap


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