arcgis desktop - Why are These KML Polygons Not Filled With Assigned Colour in Google Earth?

In ArcGIS Desktop 10.2.2 I converted a Feature Class into a KML using "Layer to KML (Conversion)".

The polygons in that KML look like this in Google Earth.

Why are (most of) the polygons rendering "oddly", that is, lacking a solid fill colour, and often mostly entirely absent?

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@MichaelStimson provided the solution (to run Repair Geometry tool). See results below.

Answer

It seems that your geometries have errors, either self intersections or incorrect ring orientations which make them unsuitable to display in KML. According to https://github.com/Ecotrust/madrona/issues/186 KML insists on clockwise (exterior?) ring orientation.

Run Repair Geometry on your data before exporting to KMl to fix common geometry problems.

Repair geometry is the first thing I do when a feature class doesn't behave as it should.