Darius Crowley + sweeping strikes killing more than 1 only yields 1 buff, but he flashes for each kill, please fix
Did one of the minions have divine shield? There is a known issue with Poisonous and Lifesteal and attacks such as Sweeping Strike when it is targeting a minion with Divine Shield.
So this could be another side of the same issue.
No, no divine shield, I killed 2 at once on 1 attack. He swung, damaged both, killed first, flashed for passive ability, gained buff, killed second, flashed again, did not get a second buff.