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It is definitely a 160mm fork! Issue lies with the combination of centerlock rotors and fork. I emailed Hunt and they said they have had the issue on a number of forks with their wheels. If forks are only ever tested on 6 bolt hubs then sometimes the centerlock to 6 bot adapters can rub on the fork leg (which mine did until I switched to centerlock rotors and no adapter). They recommend the narrower lockring that @Alb mentions above to give a little more room still.
Hang on. If the caliper fits without an adaptor with a 160mm then yes they are chatting rubbish it wont work with a 140mm. Pics of it on probs best.