Character:Sets-Tail-On-Fire
The skill Illustrious Healing (Resto Staff) will not level anymore. It is still rank 1. It is on my bar both while I kill and turn in quests, and I am even using the relevant weapon. The weapon is gaining experience, just not the skill.
Why?
I bought the second skill on the weapon first, and did not get Illustrious Healing at first. When the second skill was almost fully leveled to rank IV I decided I would pick up the first skill. Once the second skill maxxed at Rank IV (ready to morph) then the first skill stopped leveling. Its as if it checks the highest skill (as unlocked by level) to see if it needs to be granted exp, and if not then goes on to next weapon. So ever since skill 2 no longer needs to be granted exp, the skill 1 has been stuck and can not be leveled.
I played a while without add-ons to be sure. Also, other skills for another weapon (bought in order) will benefit from kill or quest exp if on my bar. Just not that one.
This character is low enough I may just delete and remake her, and be sure to buy skills in order next time. But this is an unpleasant bug.