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Me and my guildie had it happening while we did a heart today. Each time we killed certain mobs down by Slieves Waypoint (Sp? Not in the game at the moment) in Caledon it would give us both that message. Only some mobs, not all.
These mobs are most likely grubs. They seem to be adjusting the loot that is dropped. As they are easily farmed for Venom sacs.
Shunsui Kou Kyoraku~Thief |Afro Claptrap~Warrior|Korra Jorradóttir~Elementalist
Zaraki Bladebreaker~Guardian|Mikasa Ackkermann~Mesmer
That could be right. i fought risens during these quests and there where grubs, too.
That happened to me last evening during the personal story episode on my engineer where I was exploring a cave near Junction Haven for the Priory. I thought it was a bug until I saw a thread earlier today where somebody was complaining about not being able to farm risen grubs anymore (during some event where a risen giant spawns these creatures) and mentioned the message.
Add me to the list of people who see this error message frequently when killing grubs. I do not remember seeing it any other time — just when a grub I was fighting died.
Happened to me when trying to talk to a merchant.