spell based of barrage problem

[BRUTAL]

i have a spell that makes a unit multishot, but i only put max targets as 1, so that would be 2 targets counting the heros attack, but when i change certain fields like targets allowed, it changes it, so it hits 3 all together, and i want the targets allowed to be the same as what the hero can attack, but when i tried that, it would attack a friendly unit sometimes
so why does it do that