Game Mechanics: Weapon Skill-Ups bugged?

[choster]

Lvl 22 shammy here. I've been trying to get a second weapon skill maxed since I hit level 12... I can keep piercing maxed, 1hb at cap-10, and 2hb at cap-50.

It is partly weapon based as my blunt weapons are trash. Still, I seem to cap piercing within the 1st orange bubble, and then the next 4 bubbles net at most 4 skill ups.