Hitboxes are a real problem in this game
I'd like to preface this by saying that I lost my last game because of this. I had ult and likely could have gotten out, but in this game hitboxes are such a huge problem.
We have all seen thresh hooks that magnet to you, or leblanc chains thrown backwards that still hit you somehow. Leona is also not all that uncommon. It's so upsetting when a skillshot you so obviously dodged still connects with you, and there was absolutely nothing you could have done to avoid it - not even getting your champion model entirely out of the path of the skillshot.
I don't know what Riot can do about fixing skillshots, but something has to be fixed, because stuff like this is just insanely unfun to play around.