Strange matchmaking

Hi everyone, Aceblade here. Currently gaining +34 LP in Twisted Treeline Ranked Flex, was matched with a Diamond and Platinum Summoner, (I'm Silver). We won a game, they added me to play again however their rank was too high for me to join. We queued at the same time and had the same team again. Doesn't this counter the fact that lower rank's cannot duo with higher ranks? Thanks!
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