Why unranked and players below level 30 are getting matched vs plat/diamond/master players?

Since patch 7.13 im getting matched with unranked players or even people below level 25 in normal games. You think it shoudn't matter because its a normal game but they usually ends up feeding enemy team and I'm simply losing games because of it. I understand they're new players and they're still learning the game but why are they getting matched against diamond and master players. Once there was challenger lb in enemy team and my adc was level 27. It's just much harder to win the game when some of your teamnates have no idea what they're doing.
Report as:
Offensive Spam Harassment Incorrect Board