Only one hero available to pick in ARAM

Hello, I recently played an ARAM (All Random All Mid) and my team was only able to pick one hero. I believe this is a bug because I did not queue up for the mirror game mode. I had decided to play All Random All Mid because that was what I wanted to play; somehow the game loaded up in the incorrect mode. If I had wanted to play this other mode, I would not have queued up for ARAM (All Random All Mid). Please respond. Thank you.

there won’t be a response, it’s not a bug (ie, intended behavior) having all the heroes ‘randomly’ be the same is still ‘random’.