If you’re playing Slayer and you pick up High Tally (Increases Trophy Hunter Stacks by 1) while having Adrenaline Surge (Gain ult cooldown on max stacks), the Adrenaline Surge passive stops working.
The passive will tick when you get 3 stacks, as usual, but when you get to 4 stacks, the passive stops ticking and you have to drop the stacks to be able to make use of Adrenaline Surge again