Yep, they have never been consistent. Remember Electrum Ingot?
Electrum Ingot: iLVL40
Made from Electrum Ore: iLVL43

Used in Weaver recipes:
Linen Gaiters, Linen Half Apron, Linen Wedge Cap of Crafting): iLVL37
Linen Coatee of Crafting, Linen Coatee of Gathering, Linen Wedge Cap of Gathering: iLVL38

The annoyance here, was need an i43 item to make an i37 item.