Bard's Cosmic Binding bug

I noticed a weird mechanic with Cosmic Binding: when it hits an enemy, the spell is supposed to continue on to a second target or wall behind the initial hit. On several occasions, though, I have seen the spell hit on minion and, instead of traveling to the champ behind that minion, the stun will proc on a minion to the right or left of the one I hit, even when there should be enough space that the spell should not connect with the second minion. It is like the spell sometimes makes a 90 degree turn on hit. Has anyone else seen this?