[Tilecache] tilecache generates too many tiles

[p3p]

Hi, 

my problem is, that tilecache generates too many tiles, see image (zoomlevel
0) 
tilecache generates for lvl0 4 Tiles, with Mapnik there is only one image
for lvl 0. 

tilecache.cfg: 

[osm] 
type=Mapnik 
mapfile=/home/osmserver/mapnik/osm.xml 
spherical_mercator=true 
extension=png 
metaTile=yes 
metaBuffer=256 

http://n2.nabble.com/file/n4618619/screenshot.jpg 

thanks
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