Leona ult bug?

I really hope this is a bug and will soon be fixed! Maybe it's part of the new missile system? I don't know, but I was playing a game as Jinx against a Leona support earlier this evening, and as soon as she hit 6 she obviously started ulting me. The thing I noticed was that when she ulted she did not have to land it right on me to stun me for full duration as if she HAD landed it right on me. That's how how it's supposed to work, right? It stuns you if it lands right on you, but only slows if you get hit by the radius. Right?? Because this happened more than once that game! Several times, where I know that normally I would not have been stunned (I'm lvl 5 Jinx so I won't claim to be good with her but I'm pretty familiar at least with her hitboxes and things, and I'm fairly confident that I should not have fully stunned by any of those ults except maybe one or two. And when I tried to point it out and see if I was imagining things or what, the enemy Sivir simply said "Stfu plz". Not very helpful. If any of you have insights or have noticed this too, please let me know!! Let's get this fixed!