When I'm pressing some keys, they get typed along wth other keys, but it just happens with a few keys, the other aren't affected.
I have got a Logitech G105 Keyboard with german Keyboard layout.
When I press "i", then AltGr gets typed as well.
When I press AltGr, then "i" gets typed as well.
When I press "r", then "1" gets typed as well.
When I press "1", then "r" gets typed as well.
When I press "ß", then Enter gets typed as well.
When I press Enter, then "ß" gets typed as well (However, this doesn't appear when pressing enter at the numpad).
When I press "l", then the Menu Key gets typed as well.
When I press the Menu Key, then "l" gets typed as well.
This error first appeared shortly after I assembled my PC half a year ago (but the Keyboard is older though). It didn't appear all the time, but like 90%. Sometimes I can type normal for a few seconds, then it comes back. I had no trouble with it for a few months, then out of the sudden it came back. Only thing that was special was that I was using KeySticks the first time in quite a while, but deinstalling KeySticks didn't helped.