Hey Omar,
That's quite impossible — the Keyboard Maestro Editor cannot be active unless it is open.
On the other hand the Keyboard Maestro Engine can be active when the Editor is not open.
You looked in the Console?
What log?
Did you look in the Keyboard Maestro Engine Log?
Open the Keyboard Maestro Engine Log in the Console or BBEdit
As far as I know Keyboard Maestro doesn't have such a thing as a voice trigger, so can you be more specific?
-Chris