Weapon crafting question. Is this a bug?

[Thiar]

Is there something I dont understand or is this a bug? Cant get any gains to advanced blade crafting. It just shows 0. My basic blade crafting skill is couple levels higher now.

 

[Rhias]

You need at least lvl 50(?) or 60 in basic sword crafting to unlock the advanced one. You most likely had it at another point of time on an higher level.
You either lost some attribute bonus points due to changing your attributes, or you lowered your blade crafting skill limiting the basic blade crafting to 48.