Hi, there.
What is happening is VoiceAttack is intercepting your keyboard input and suppressing it. Once your keyboard input is suppressed, VoiceAttack may be, 'pressing' other keys. This is by design and VoiceAttack is doing what it's supposed to do. The purpose of this is to allow for commands to be executed by keyboard shortcut. This is fairly common when a profile is downloaded from somewhere and the user is not aware that this is going on.
To see what keys VoiceAttack is intercepting, simply open the profile edit screen and sort the list by, 'Shortcut' descending.
You can remove the behavior by editing the commands you do not want to keep and unchecking the box labeled, 'when I press keys'. Also, you can stop all keyboard shortcuts related to commands by clicking on the keyboard icon on the main screen.
Hope that helps!