Question about match making

SO I have a question about match making (duh), so when someone is on a winning streak (5 games) are they supposed to be put with people that are on losing streaks, people that afk or just people that are lower level, because I have been on a 4 game losing streak and three of them were because of people afking and the other was because I was put with a level 24 , just wondering if this is normal or I just have the bad luck this week.
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