Can someone explain this?

So, this game was in the showcase, and I saw the name "Ban Nidalee" so i was just curious what their win rate was, but I went on and Nidalees team was full of diamond/master/challenger players and the entire other team were all under level 30? As you can see in the screenshot, its looking pretty rough for the under 30's team... So, to solve my confusion.... 1. Why was this game in the showcase? 2. How did these 2 teams even get matched against each other... Like 3 diamond players, a master and a challenger against a couple level 20s? Matchmaking might be a tad broken....
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