It's a good observation though...
We will change the tooltips of the recipes, so when you move your mouse cursor over it, it will tell you that it's "Crafting Tier", not "Tier".
Because the people often get confused that when they reach level 10 (Tier 2), they can craft Tier 2 recipes.
However, Tier 2 experience and Tier 2 crafting are two different things.