score:0

For each series data, I had to use

pointRange: 86400000 // equal to one day

The first answer here solved it.

Highcharts columnchart: How to seperate overlapping columns

score:1

First thing I notice is that your data is not for the same timestamp. This means that the data will not stack as their x-values are different. If you want all data to for a given date to be stacked then you have to give them the same date (and time). The dataGrouping only applies to HighStock. Your toolTip text can be formatted.

score:1

The cahrt is displayed correctl,y becasue you have stacked for the same x value, for for different, points are neighbours.


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