Heatmap X-Axis - Simple number sorting issue

I'm looking at the example populated data/graphs, and in the Heat map, I can't figure out why the X-axis ("Hour of day") sorting is not working, as shown on attached file.
For information this field is a script-generated value using : doc['timestamp'].value.getHourOfDay()
Any ideas ?

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.