Why is it so frustrating getting a chest?

Whenever I get a champion I don't have chest with yet, the game just goes horribly and I don't feel like I could've done anything better that could've resulted in me getting an S- at least, but whenever I get a champion that I already earned the chest with, I get S+ quite often and the game goes very easily without me needing to try too hard. It's just annoying when all my goals in League for today were getting a single chest, and yet still nothing.. {{sticker:sg-soraka}}
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