[Tilecache] tilecache seeding a wrong bbox when using option -b

[regioGIS]

Hello list,

I have a problem with incorrect bbox being generated for a WMS service.

This is in my cfg :
[DEFAULT]
srs=EPSG:3035
bbox=2500000,1400000,6550000,5335000
size=512,512
extent_type=loose

[urbanatlas]
type=WMSLayer
url=http://localhost:8399/arcgis/services/urban_atlas/mapserver/wmsserver?transparent=true
extension=gif
levels=9
resolutions=5291.663809168211,1322.9159522920527,661.4579761460263,264.583190458
4105,132.29159522920526,66.14579761460263,26.458319045841044,13.229159522920522,
6.614579761460261
layers=0,1

I now want to seed only small bbox, so I launch :
   tilecache_seed.py -b 3887000,3000000,3958000,3116000 urbanatlas 2 3

This is the output :
Cache hit: 3854665.93515,3093332.41893,4193332.41893,3431998.90272, Tile: x:
4, 
y: 5, z: 2, time: 0.000428915023804, debug: True
###### (4, 5, 2), (4, 5, 2)
02 (000004, 000005) = (3854665.9351 3093332.4189 4193332.4189 3431998.9027)
[0.0
007s : 882.560/s] 1/0

As you can see, the lower part of my requested bbox is not generated (
requested y1 = 3000000, tilecache generated y1 = 3093332.41893 )

How can I solve this ?
Thanks.
Ross

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