Guild Wars 2

So I just bought like 150 leather, and usually when I convert them to stretched I get some XP..
And when I convert them into maks straps etc.. I use to get XP.

Now i’m not getting any?

Why?

Because you have too high crafting level to get any exp from those. The crafting items have different color codes in the crafting menu, orange gives most exp and gray gives 0.

Or when you have 400 Leatherworking, assuming you picked LW’er, you don’t get any XP as well. But probably your crafting is indeed too high to get XP from the leather you’re working with.