Broken Dynamic Background?

So in the new client, your profile has a dynamic background that anyone that views your profile sees who you've played the most(Within your last 20 games). Originally, it worked perfectly for me, I played mostly and he was the background, then when I started playing more, he was the background, but after that it stopped changing. In my last 20 games, 15 of them are , and I Know many games before that were also , but the background is still . Obviously, this not some game breaking bug, but I just wasn't sure if it's actually a bug, or if I just missed something obvious like, you must WIN a certain amount of games, or something of that sort.