Without sounding rude, I think the majority of people would clearly spot it had two woodruff keyways before fitting it. Tho i agree, that shouldn't be normal and makes you wonder how well the cam itself has been ground - Presumably you just timed it up the standard way and didnt time it in properly (Dti gauge etc) as that would have picked up your error straight away.
I'd deffo be questioning Newman if this is standard and if not then id be questioning if the ebay seller was aware of this cam being a dud