Autofill - Is matchmaking broken?

So, I main support. I always Queue up with Supp/Mid because I want support but if there's a need I can play mid safely. But I have been given mid 5 games in a row, after that, I got adc 3 times in a row. In most of the games I got mid, I could still go support because the person who was assigned support traded (and the games I got adc, someone dodged, thankfully). Thing is, they all told me they got autofilled as support. So... What gives? Why the f*** am I getting roles other than support if the people in my game didn't even want support while I did? This makes absolutely no sense. Is it just me, or is matchmaking broken? Would love to know your thoughts, Have a good one everyone!
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