The problem isn't usually in the NPC_Types table. 
 
The problem with milti-mobs is in the Spawngroup, Spawnentry, etc tables. Search there and I bet you'd find a lot of duplicates. I linked my tables with MS Access to filter the dupes and managed to get a few done. 
 
REMEMBER THOUGH!!! 
 
If you delete a spawn from the spawngroup table, you need to delete it from the other "spawn_*" tables too. Otherwise you'll be creating a headache for the zone server. 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
	 |