when a touchpad is acting "real strange", there are generally two reasons:
The touchpad isn't calibrated (correctly)
the touchpad is using a different screen resolution, than the screen really has.
That said, I don't have any practical experience with this problem, so I don't know how to change settings and such.
Generally gOS is very close to Ubuntu 8.04 (hardy heron), so if a solution works for hardy, it most often works for gOS.