[Gameplay] Kindred's preys doesn't give stack

It's a bug I seen often while playing Kindred in Aram. Sometimes, when you win quickly stacks, you can choose (for your passive) an ennemi that you choose (and kill or get an assist on it) few times ago (you should'nt have the right to choose him, it's like the cooldown was reseted). Then, if you kill him or get an assist, you win no stack but the champ is still the target... It's pretty annoying sometimes and it's been some month that the bug exist.