Why is catchup xp a thing

You literally get punished for winning jungle because the enemy jungler who is inting will out level you due to cathcup xp it's ridiculous. A 5/1/3 kha'zix with 150 cs shouldn't be a level down to a 0/5/1 sejuani with 43 cs like it makes absolutely no sense (this is a completely random champion selection btw)
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