Matchmaking in 3v3 Flex

Hey, so I'm not someone to complain about the matchmaking system and technically I'm not complaining now either. I want to get to Gold in 3v3 this season to get the additional Victorious Chrome. So I've just played a game and I faced a 3v3 Flex Grandmaster player in my placements (currently rated SIlver 4). Is this normal in this mode? I've never really played it so I don't know. But having a Grandmaster and a Bronze 1 in the same game (both ratings in the 3v3 mode and it was a ranked game) seems a little bit extrem.
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