I am like 99.999% sure its the KML that you are using.
The regions that you have defined are not unique... therefore when there is a mapping from splunk onto the geom it is confused on which area you are talking about.
Just a quick look at your KMZ shows that you have a lot of "avtocod" that are named the same (e.g. 87, 29) and that is the default featureId that you are using. The only reason I know this is because I just had the same issue.
Try using "/Placemark/region" as your Feature Id Element.