Keyboard goes berzerk on screen lock function

Hello,

it appears to be problems when I lock my computer. When I start typing my keyboard is completely broken. I'm not sure about what the problem is, but it seems all the meta keys have gone bananas. In Linux I would simply solve it by pressing all the Metas like ctrl, alt etc, but this doesn't work here.

So, right now; Screen Lock is the same as Reboot computer. Do you have any advice for me?

Thanks.