In an ArcGIS Online web map, heat map styles appear under all other layers regardless of the layer order in the map contents.
Last Published: April 20, 2015ArcGIS Online
Bug ID Number
April 15, 2015
February 24, 2021
Operating System Version
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.