ARAM Champion Switch

Something curious happened the ARAM before last. I got Teemo in champ select, my team remembers me having Teemo in champ select. We literally were all five asking what happened when the game started, because I wasn't controlling Teemo, there was no Teemo on the map, I was running Zilean. I assumed I might have rerolled absentmindedly but still had both my rerolls. I have no evidence of this, but if this is a bug anyone else has experienced, please post up.