Champ select Champ Selection bug
If you accidentally click just a hair above the Lock in button, you can click a champ accidentally that's not even shown, for instance just this last game, I had Neeko selected, she was pretty much at the bottom of the screen that shows champions as I just scrolled far enough to see her, I acciedntally click just hair above lock in, and w/o noticing it had clicked Sion, I locked in.
I can pretty much always get this to happen if I actually wanted it to. just a matter of clicking along one of the columns of champions somewhere above the Lock in Button but below where you can actually see the champions to pick.