I need to understand why

Hey guys, Can someone please explain to me in any way possible why while playing with my friends, we're 3 Bronze and 2 Silver I, in normal matchmaking we get matched against Platinum IV and Diamond V players all the time? I'm not talking like once in a while, I'm actually seeing it each game we start. Me and the Silver friends I have have like from 100 to 300 win difference between the lost games in normal, going from 900 to 2000 won games. But it's kinda unfair, my other two friends aren't really that good at the game, not their fault, but we always get matched against Diamonds that shred their asses hence making the game kinda impossible for us, this most of the times. Would be really appreciated an in-depth explanation! Thank you in advance!
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