The Export Tile Cache tool in ArcMap 10.2.2 does not honor irregular polygon shapes for an area of interest (AOI), and the AOI polygon is converted to a best-fitting rectangle. Multi threaded python 'Export tile cache' scripts also fail to generate the cache if the AOI has two polygons.
Use the Export Map Server Cache tool.<a href="http://resources.arcgis.com/en/help/main/10.2/index.html#//005400000013000000" target="_blank">http://resources.arcgis.com/en/help/main/10.2/index.html#//005400000013000000</a>