Thanks, Linomar!
In new version 1.5.5 this bug fixed.
We place your image on
http://gis-center.org/kml/test/duas/BDE00100.454.kmzwith little offset of georeference (for demo only).
Now results see fine.
You can download file and double click on network link.
Size of example near 4Mb. We place all tiled images into one file as presentation
(use option Packing into KMZ - "pack into one "). For real works this option not need.
I add examples of borders
Level 1

Level 2

Level 3

Level 4