What am I doing wrong with Darius's Q?

Lately it would seem that if I hit the outer rim of Darius's Q it doesn't seem to make the sound effect that it does damage, and the opponent does not seem to take damage. I know that lag could be a factor but it wouldn't answer the entire question since the problem seems to be able to be consistently reproduced. I don't know what I'm doing wrong since I see other Darius players hit the Q the same way and it does damage. Perhaps I am hitting them with that notch that the hitbox shows when you place the mouse over the skill? I really don't know.
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