Rank Flex 5v5 bug or what happened?

So I'm a plat 1 player and was in d5 promos. I failed once and today got into d5 promo for the 2nd times. But something that happened, I loss the first game (1 out of 5 games in promo) but the system counts me loss 2 out of 5 games in a row??? Is this a bug or what? Please someone know this and I need an explanation. Thanks for reading!
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