is this query built to delete anything other than the duplicate spawns? If so, hold off.. the My World team is tackling this problem (and has been for a few days) already.
When we merged data from another worldbuilder's sources, the transition wasn't entirely seemless =P but we're cleaning it up now. The id #s for the duplicate npcs are far too high, and contain strange lootdrop entries. Next DB release
should contain a fix to this problem, but don't quote me. Sometimes we release the DBs before they're ready just to satisfy worldbuilders and serverops.. although I'm pretty sure this is the basis of our next release
Mollymillions -- We (MW DB Team) need you on our team.. check out #npcmovdb (and stay longer than 5 minutes, hehe.).