Not getting main role - More info inside

~9 queues in a row I didn't get my main role. Okay, it happens. Bad luck, right?

I had a 3 man premade last night, where I went Jungle/Support (maybe it was Jungle/Fill), and my friend went Support/Jungle. I got Support, he got Jungle. Whether or not I chose fill, I got his main role, he got my main role... If a premade is getting those roles, shouldn't we be getting our own main roles?