that's key ghosting you can use passmark keyboard test to find a set of keys who doesn't fall into this problem, i used it for guitar hero to find a good set of keys to play it (enter,del,end,avpag,num7)
That's key ghosting.
edit:You can use passmark keyboard test to find a set of keys who doesn't fall into this problem, i used it for guitar hero to find a good set of keys to play it (enter,del,end,avpag,num7)
I found something better to explain the problem, and to test your keyboard: on this https://www.microsoft.com/appliedsciences/antighostingexplained.mspxpage.