Appears to be a bug on the Lady Inerva Darkvein fight regarding placement of Demonic Gateway & Demonic Circle.
Every time one of these spells was placed at the back of the room (furthest away from boss near entry point) her potions would be thrown on top of them almost as though they were treated as players. This happened during 2 wipes, third time after I removed them, potions were no longer thrown that far back.