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Blizzard Fixing Issues Causing Duplicates of NPCs and Mobs
Source: Wowhead

Blizzard is addressing the issue of NPCs and mobs being briefly duplicated across each layer.
For a brief period of time, NPCs and mobs had multiple copies of themselves, creating some very dangerous areas, or many clones of the same NPC.

Blizzard posted in a server message that this is being worked on after a "blip in the multiverse".
[SERVER] Greetings! There was a slight blip in the multiverse. We are in the process of de-blipping all zones now.






