Constantly getting doubles using team builder

Here is what I mean by this: It feels like almost every single game, I end up with doubles. So, thresh on my team and on our their, vi on my team and on their team... Not just one double every now and then, but TWO doubles, and almost every single game.

It almost feels intentional, too. I will play five or whatever games and not see a single thresh. Then, all of a sudden, I decide to play thresh and BOOM, he's on the enemy team.

I think team builder needs a tweak. I'm sick of these games with doubles.