[Gameplay] Kog'Maw increased attack range

This may occur for more than Kog'Maw, but I found myself in a game where I had my W maxed and I was at the middle inhib of my base, and started attacking a minion all the way on the left side of my nexus. My autoattacks were flying over my head backwards hitting the minion although I was quite out of range. I don't remember how to reproduce this but all I know is that it has something to do with the camera movement.