Taking damage while winning in TFT

Hey I've got a question, I was playing TFT and I was low on hp but I was winning. I won the round, quite hard in fact, but I still took damage which made me lose, so I died and finished 7th ;_ ; So I was wondering, is this a bug? Or did something make me take damage which I am not aware of? If someone could give me some insight in this, it would be greatly appriciated. Thanks <3
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