Spells: NPC DoTs remain after cure

[Mountaineer]

Ive tested this out several times now in burning woods. a sarnak zeelot will dot me with Venom of the Snake, I'll cure it with Counteract Poison (icon will disappear and it will say you have cured your target of venom of the snake). Yet my HPs continue to decrease until the 42 seconds or however long the DoT had on it is gone.