gnome 3.6 numlock

[polslinux]

I have just made a fresh install of Gentoo and now i'm on Gentoo ~amd64 (gnome 3.6).
I have a "problem" with numlock.
When i am at the login screen (GDM) the numlock led is ON.
After i logged in the numlock turn OFF if and only if i touch something (eg keyboard and/or touchpad).
But the strange thing is that only the LED is off because the numpad work! In fact i have to press 2 times the numlock button the get the led on again!

What can be the problem?