I've always looked on Firetooth & Gesen not as firing their own arrows, but adding their Fire or Electrical damage to whatever ammunition you happen to be using. (Much in the way that the Heay Crossbow of Searing "Sprays oil on the bolt, and sets it alight as it is fired.") If this were an actual bug, you'd think BioWare would have corrected Gesen, or at least not duplicated it with Firetooth.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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