Sion E-Minion interaction glitch.

I play often, and I've been noticing a weird glitch with his E; Sometimes when I hit a minion with it, the minion deals 0 damage to minions and enemy champions, as well as failing to apply the slow, but it still travels the full distance. Other times, the minion will stop at the first minion it hits, dealing damage to the second minion but otherwise reacting as if it had hit a wall.

I'm not sure if this is unique to Sion's E, or might effect other champion abilities that use a minion (or even a champion) as a projectile. But I can say that it's been happening to me alot, and it's having a large, negative impact on my laning.