Why is this happening?

Why am i getting matched with diamond 2? I'm mostly talking about the nidalee who was challenger flex queue and diamond 2 in solo duo queue poppy was also platinum V flex, gold 3 solo queue and diamond 5 3 v 3 I would probably only reach silver 1 if i play ranked and i really play garbo in normals, so how do i get matched with these people? Because playing against someone who is better then you can be a good lesson, but getting totally destroyed isn't fun at all....
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