Primary Supp -> gets Mid 3 out of 4 times

So, I'm a support main and go to flex and soloq with primary support and secondary mid lane. Today I played 4 games of ranked flex and got mid three times. I got to change to support in some of them but why is this happening? I never get mid and I'm totally fine with that, I'd rather play only as support. I read somewhere that a support main should almost everytime get the role because there's not many people who want to play support so it's rare to find a willing player. Maybe I have just been ''unlucky'' but it's very weird..
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