From the Weapon Master's Handbook
Taking Defensive Weapons Training at an appropriate level as a Weapons Training class ability does not confer the Shield Bonus from either the ability or the halved weapon enhancement bonus.
Expected: "The fighter gains a +1 shield bonus to his Armor Class. The fighter adds half his weapon's enhancement bonus (if any) to this shield bonus. When his weapon training bonus for weapons from the associated fighter weapon group reaches +4, this shield bonus increases to +2."
Attaching character sheet w/ appropriate level.