Visual Bug Corki
I've had a red buff throughout the entire game last game. Not sure when I noticed that i had this red buff, but throughout the entire game (throughout deaths and all) this red buff was applied to me but didn't apply on hit affects or have the red buff above my spells. Even after taking my own red buff during the game.
As far as game details and interactions that may have something to do with this, I was playing Corki, my support was Zyra, our Jungler was Yi, we had a Renekton top and Lissandra mid with ignite. Enemy team was Veigar mid with Barrier, top lane Darius, both top laners had TP, a Kha Zhix jungle, and Lucian/Lulu bot lane. Hope to have this fixed soon, I've only experienced it once so far, but that's the only Corki game I've played/seen today.
If looking for replay evidence the bug happened under the summoner name Wut R Mechanics.