Scattered Ranks in Competitive?

When I’m playing Solo/Duo play list, I actively see either my team be completely stacked or the opposing team be completely stacked with players at no point should there be a team full of diamond players against people doing placement matches. There is enough players in the que to prevent that.

Is there a logical reason why this keeps on happening? In MCC it was a tad bit scattered but that’s because of the limited pool. On this title we don’t have that excuse, there is enough players.