geoserver openlayer and googlemap offset

geoserver openlayer and googlemap offset

in my application I am using a googlemap as baselayer and geoserver as wms
server for adding several layers to the googlemap, at the first load there
is an offset between the layers and the googlemap, it disappears if I
switch-on and off some developing tool in a browser, like firebug on
firefox and development tools in chrome, I activated the sphericalmercator
on the baseLayer, but still there is the offset, my code is visible at
pastebin.com/rn9xQbke, I need someone more experienced to point me on the
right direction