Matchmaking at it's finest.
Screenshot
That looks pretty even, doesn't it?
That looks pretty even, doesn't it?
Its a normals match, ranked mmr has no affect on your normals mmr. When you face somebody who is high elo its most likely because they play a lot more ranked matches than normals matches, so when they go into normals they pick up baddies like you and your team, who have low normals mmr.