More CS, behind in level, what is this?
I've noticed in MANY games now that I have reached lane before minions spawn, arrived with the first wave, and gotten ahead in CS (often as far as 3 or 4 CS ahead) when my lane opponent hits level 2 and I do not. In bot lane I thought this was because of how XP share works or something, but in top lane, 1v1 I've had games where I am 3 or 4 last hits ahead CONSISTENTLY and my opponent hits level 2 and 3 before me. I have given first blood on a few occasions because my opponent hits 2 before me with literally ONE last hit and all-ins while I am still level 1, and they hit 3 before I get back to lane.
What system causes this and why is it in the game?