What happened:
I had been playing Historic ranked for a bit when one of my friends came online and asked if we could play a few games. After a few rounds with 60 card decks he asked if we could play Brawl so I sent him a challenge. I had to select a deck in order to send the challenge since the deck I had used in our previous game was not a brawl deck. After he accepted the challenge, I clicked the "Play" button since I had already selected the deck I wanted to use. Apparently, this also added my to the Bo1 Historic Ranked queue since while waiting for my friend to select his deck I was put into a Historic match with the deck I had been using earlier. I immediately conceded the match since I did not choose to start it . I looked at Untapped.gg and it was confused by this, thinking I managed to play a ranked Historic match with my Brawl deck. (see attached images)
I ended up cancelling and resending the challenge and it worked just fine that time, so I don't exactly understand what happened the first time.