Ashen Juggernaut bug

I was using ashen juggernaut conduit for some raid bosses. I’ve noticed I wasn’t getting any stacks of ashen juggernaut despite spamming on the boss. I checked details after the fight and it didn’t show any of the stacks either.

Anyone experiencing similar problem?

I get the buff, but I feel like it doesn’t even add up/work

Imagine if we had a conduit that was actually worth a damn.