[Client] Roll queue doesn't seem to be choosing roles correctly

I just finished a game where my friend and I were queuing together. He queued for mid and support, and I queued for top and bot. However, when the game was found, I got support and he got bot. Obviously we should not have been auto-filled because we both chose the opposite roll.

This is not the first time that I have experienced something like this. Just two days earlier, my friend was auto-filled for bot and I was auto filled for support. Neither of us queued for support, but I queued for bot. So then, I should have gotten bot while he got support. I just have to wonder how often I get auto-filled into a roll that someone else in the match queued for, and it seems like this can't possibly be working the way that it is intended.