How to create a column range chart in Highcharts using range and navigator functions?
So after a few hours of digging, I have just found out the culprit (or I really hope so). The problem is your definition of yAxis label formatter: yAxis: { tickInterval: 1, gridLineWidth: 1, labels: { formatter: function() { // THIS IS THE PROBLEM if (tasks[this.value]) { return tasks[this.value].name; } } }, startOnTick: false, endOnTick: … Read more