Squishy Warrior for no apparent reason

[OrganizationXIll]

I did Haukke Manor with the Duty Finder last night and the tank in my group was a warrior. He was level 30. He had HQ level 25 gear in most slots and was using defensive buffs when possible. He should not have been needing cure 2 on trash mobs. I am so confused and would love to know if anyone has some reasoning for why he was squishier than every other warrior I have seen.

EDIT:
1) He was definitely a Warrior.
2) I was the healer and he did have protect the entire time.
3) He did indeed have tank gear on and not just general DoW gear.