Resolution

The following options can be as workarounds for the issue:

Option 1:

1. Install 2018.2.3 or 2018.3.0 and open the affected workbook.
2. Refresh the shape file in the workbook using Right Click > Refresh on the data source.
3. Save the workbook.
4. Republish the workbook.

Option 2: 

1. Republish the viz as point distribution map instead of a filled map.

Option 3: 

1. Remove the custom polygons from the viz.

Cause