I would like to host an Openstreetmap server using Geoserver (Geoserver/GeoWebCache/postgis). However, I encounter a problem regarding the tiles and gridsets. TMS urls (myserv/z/x/y.png) are different than urls from openstreetmap.org or MapQuest. Furthermore, there is an offset on the y axis. The following url shows an area from my own server. The other url shows the same area from Mapquest.
The offset seems to be caused by the zoom level (here 14~=15) and by the y value (12392->11637). I hope my issue is understandable and that someone can help me.
(Sorry for my english)