Guild Wars 2

Today used the scroll of experience to level new engineer to 20, which meant traits!
at this point is started leveling the rifle with Firearms – IV equipped.

When I change this trait all my the rifle skills progress was all removed and had to be unlocked again.

Putting the trait fixed this but in my weapon tab on the skills list they are not shown to be unlocked, but looking at the equipped weapon you can see they are all usable!

Screenshots attached which shows all the skills unlocked on the bar, and not in the weapon tab, when i changed the trait the skill were locked.

Screenshot of the trait changed to II
Edit: Changing it from trait IV to anything else in tier one caused the same result of halted progress
Also an issue when re-equipping the pistols..