Why Flex Queue Put You In A Different Rank
It seems like people have had the wrong impression of Flexq as of the patch last night. Let me clear some things up, so players won't be so rowdy.
Read this - if you want the developer's standpoint. http://boards.na.leagueoflegends.com/en/c/developer-corner/7i1WBYXy-update-on-preseason-ranked
Before the little patch we had last night, MMR was all messed up. We had Bronze with Diamonds, and it was just unhealthy as can be. And you might've gotten a higher rank in placements because of it.
What I'm pretty sure they did, was hard reset Flexq (meaning that it's practically like playing on a new account and doing placements.) They didn't want this, so they changed it back to a soft reset and made you do one more placement game, making it so that you're current Flexq rank is closer to what it should be, rather than being sometimes way higher than your current rank, or way lower. Which makes it so that Diamonds aren't playing with Bronze, and Golds aren't playing with a bunch of Bjerg mid laners.
Note - For the newer players to ranked, your placement games will never go up to your last seasons rank, or necessarily close to it. Let's say you finished Silver V in season 6 and you just did your placements. You'd likely get B5, maximum B3.
I hope this helped some people out :).
GLHF mates! Comment below if you have any questions, or go to the link above and comment there.