score:1

I've reproduced your example and I believe you wanted to add your tickPositions property to the yAxis (in the bar series yAxis is horizontal by default, so you may have missed it).

  yAxis: {
    tickPositions: [0, 1, 2, 3, 4]
  },

Live Demo: https://jsfiddle.net/BlackLabel/v1f2d5mp/


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