I just experienced this myself and lost 15% xp from it!!! ONLY the lumpy's should be seeing invis. I now see why noone goes in here for xp!!! 
 
What do I need to find to prove this? 
		
		
		
		
		
			
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				Siza Kix <Aftermath> 60 Human Monk (Blue) 
Minglewood <Aftermath> 56 Wood Elf Druid (Blue) 
Piddyda 35 Erudite Necro (Green) 
Waxyn 25 Iksar Monk (Green) 
			 
		
		
		
		
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