Umm, matchmaking?

What is the deal? For at least 3 weeks now I have been being matched up with high masters/low GMs and i’m not entirely sure why. I’m only a low diamond player and i have lost most of these games by being rolled, why does it still match me with these people?

Because they lack players in their bracket queuing for a game and you’re the closest thing to a “fair” match the matchmaker can find.