Not getting my first role?

I've queued up for over 20 games this season, selecting mid (my best role) and top/jungle as my second, only getting mid 3 times? I keep getting top over and over again, and I'm suffering because I'm not able to play the role I like and perform best at, it's becoming so frustrating that I'm considering it to even be a bug at this point. Every single season I have climbed with mid so I don't see how the new role mmr could affect this? This has never happened to me in any season. Someone with an explanation please
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