Display MoreOn Warrior/Druid.
The skill "The last resistance" (494036) is bugged.
It is supposed to make stacks from Stiffle (499499) unconsumed on the next use while the buff is active, however, if you already had some stacks of Stifle left, the skill goes into cd and your stacks get consumed too.
The only workaround is to try to remove the stifle stacks you have before using the skill, these stacks can't be removed from the player buff bar UI nor via CancelPlayerBuff(x), and in some situations, you have no target to hit to remove the stacks so you have to wait until Stifle buff wears off otherwise you sacrifice a big portion of your burst dmg.
This is not a bug. Skill clearly says that it will make Stifle be not consumable if used while this effect is active, it won't be changed, but buff will be cancelable next patch. If you think there is a translation issue, let me know.
Greetings