Heatmap don't show all categories in yAxis

I'm trying to render a heatmap graphic but not all of yAxis are displayed in the chart, even putting turboThreshold to 0

My jsfiddle example:


My series array

series: [{
      name: 'Trafico por horas',
      borderWidth: 1,
      data: [ ... ],
      turboThreshold: 0,

At the end of categories there is a "68" I don't know what does it means.

1 answer

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