Ekkos ult in aram

i just played a game of aram and i should been recording but whenever i hit 3 or more people with my ult any extra wouldnt take damange idk why or how but i would constantly stun hourglass then ult and only 3 people would take damange no matter of the others were closer or farther, and this isnt a i did no damange its a i had 1.1k damange on ult and it didnt hit everyone in my ult