where is my polygons?

[Sergey Fedutov]

Hi!
 
I need to render map with buildings layers. (See
http://getart.ru/~katsay/tile1.png) and all work fine. 
But, if i expand map Extent up to 20 meters i always get absent some
polygons. (see http://getart.ru/~katsay/tile2.png)
Map scale about 1:10000. (on bigger scales 1:25000, 1:50000 all works fine).
 
Layer data stored in WGS84 projection and reprojecting to UTM (esri:53004). 
I try render layer from PostGis and  shapefile, i try modify layer data to
close all unclosed polygons. (Via FME Suite). But always get same results
with buildings layer.
 
Note, major roads (polygons too) rendering is allways perfect. I use
mapserver 4.6.0 via phpMapscript.
 
Whats wrong? Any ideas?
 
Thanks.
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