Back story/How I found the glitch: I've been challenging myself with different combinations of AI settings in the hope that as I get used to tighter build orders I can be a threat to harder as I get better slowly.
The problem: on the swamp map for 3v3 games where the barbarian AI on the top-middle and bottom left go inactive early in the game. At one point I spawned in the middle and wasn't sure why the game was so easy compared to the other ones. But when I checked all my old replays I realized one of the bottom players never played in any of them so it went from balanced to imbalanced.
I tried to find the replays. They show up on my play history on BAR:
But not on the website. I hope the screenshots communicate clearly enough what I was seeing.