Out of curiosity, what is the highest number of duplicate bans you saw?
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I got 4/5 once
Snap, I even have the screenshot https://gyazo.com/3fd693de63afbfab6074b85c2ccca266
2...a few times...mostly it's 1...only seen 0 twice as well.
Haven't played many games with the new 10 ban system yet, but I have already experienced triple repeating bans.
one
3 in the last game before someone dodged during champ pick

obviously something's wrong here if these 3 were banned by BOTH sides.
Most common duplicate ban: Yasuo
Second place is tied between Draven, Xayah, Lucian, Lee Sin, Caitlyn, and fiora.
That all of these are AD champions and 4 are Adcs (5 if you count yasuo) should say something.
Not really related, but the enemy team in the champ select I'm currently in banned one champ.