Wiki isn't a source to cite something as bugged.
Allakhazam post from 2002:
http://everquest.allakhazam.com/db/npc.html?id=6113
Quote:
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Definitely quite common..atleast 3 drop out of every 4 spawns on average in my experience
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Indicating it is not a 100% drop rate, by fairly high. Sounds like bad luck or it's possible the drop rate is set low, but out of 4 kills you can't determine that.