I really do not know anything thing about Indonesian weapons but have enjoyed this topic.This picture, Durga killing the buffalo demon at the temple of Siva, Loro Jonggrang, Prambanan, central Java ,along with other images throughout Asia show her with these many hand gestures.The one with the folded middle fingers must be the most important as this seems to be the only one shown on the handles ,all on the left hand, so I do not think it is damage or a fault in the wood but a diliberate detail.I could be very wrong Tim.