FFA Matchmaking Ranks are Broken

I’ve been doing some FFA since it’s all about my skill and not having to worry about my teammates being scrubs, but there is a serious problem in FFA. I’m being matched against Diamond players and I’m a Gold 4, so are you seriously telling me FFA has a very low population that I’m being matched with players 2 leagues above me? Though to be fair, many of those players don’t destroy me as expected, but what are they doing in Diamond then? I understand being matched with Platinum every now and then, but why Diamond players? Diamond players are so much more common than Silver players in my FFA matches, which is completely broken.