The data does not correspond to the category by its name, but by its array index.
So, with your categories array, the x value for "RNV-A" would be 0. "RNV-B" would be 1, "RNV-C" would be 2, and so on.
1) categories - You can use label formatter and check if it is number, http://api.highcharts.com/highstock#xAxis.labels.formatter
2) X value cannot be a string, it needs to be number. In case when you would like to have datetime type of chart, you can use pointStart / pointInterval, and then set tickInterval on xAxis (time in miliseconds)
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