Reported by a guildie:

Weightstone & Whetstone should be part of the "Weapon Stones" spec.
Weightstone seems to be incorrectly grouped in the "Tool Enhancement" spec. I don't know how far downstream this affects Weightstone profitability calculations, I'm not super informed on Blacksmithing.

Above not to be confused with Razorstones, which is a temporary enchant for profession tools, and does belongs in the "Tool Enhancement" spec.

I see now that Razorstones is also miscategorized in the opposite direction; it is grouped with Weapon Stones when it should be with Tool Enhancement.

@mechiah Seems to be a blizzard problem