Issues with Ranger weapon sheild

[Trelaboon]

I feel like this might be a dumb question and I’m just missing something, but I can’t get my newly 60 Ranger’s weapon shield to work.

I have two 60 Rangers, one I’ve had on blue for years, and one that just hit 60 on green. I’ve used weapon shield on blue for years to bump in raids etc, and I’ve never had any issues; I hit the discipline and it just works. I just hit 60 on my Ranger on green and tried using it against a random mob in KC when I was close to dying. For some reason it didn’t seem to work, I continued to take melee damage for the duration of the discipline. I’ve tried it several times since then and still, every time, I take damage while the discipline is active. Stamina bar is full and I can’t figure out why it’s not working.

Again, this might be dumb, and I might be missing something. Any help?

Edit to add: The attacks are all frontal melee attacks, just in case someone might think it’s because I was being hit from behind.