I think my MMR might be messed up a little.

Not saying this a consistent problem, but every now and then I have these games where I'm matched with players that make me go "Wait, what?" I don't mean from any gameplay perspective, but a couple days ago I had two people on my team that were Diamond 1 and Level 15. I'm currently Gold 1, so I usually play around people of my skill level (low Gold through low Plat).

Is there any easy answer as to why this occasionally happens?