To root or not to root (DOT dmg)

[sogundordor]

hello guys I'm new to druid[You must be logged in to view images. Log in or Register.],
usually i'll do some root rot when i have spare time.
From wiki i read something about moving mob is taking less dmg
"If a mob is moving (not including a result of fear or flee) when the damage from a dot is applied, it will take 66% of the damage that it would have normally taken."

Is a rooted mob count as "moving" ?
I found its weird when i doing dot root rot some Snow Cougars in IC...
i usually snare, root, Immolate then Drones of Doom, its 4%hp per tick
when cougars hp under 20% and root break with snare(not moving), it become 7%hp per tick[You must be logged in to view images. Log in or Register.]

is it a bug or dot only do full dmg when mobs non moving non root?[You must be logged in to view images. Log in or Register.]