High Skill Disparity in the same ELO

Hey all!

I just come of a session of LoL DynaQ, and i that is not the topic so please dont... you know? So i really need some input from others, because the games were so onesided it was not even funny, and it is not because of premades i think (1v1 firstbloods under 3min in lane etc)

Either the whole team stomps hard (and i mean S rating hard, got one with Aurelion and Swain, without much practice) or all lanes lose, and i dont exclude myself, i also get DESTROYED in some games, in other games it feels like the enemy is leagues below me, and when i check, they are all around silver I (my league)

So i would really appriciate some inpur as to why players so much better than me are stuck in my league, and players so much worse than me are also in my leage?!

In the end i would love to have a close game once a while, and i have had maybe 2 in the 70 ranked games this season...

have a good day all!