Question about Mach Making

Hello guys! This is the first time i am posting here. Now, i am trying to climb, no surprise there :D , but i have noticed something rly strange ( happened to me last season, it is happening now as well) when i am about 60 something win rate everything is good, people are saying "hi" in chat, friendly dudes in general, and after that, all out of nowhere the game starts to mach me with people that are on a loosing strike, flaming in chat, inting like crazy, feeding on purpose. How is that happening? Has anybody else experienced the same problem? Now it happened to me while i was 65% win ratio and when i played a game on 7 LP and i lost, it dropped me a division :X
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