When I test my army, if I select a different one for the AI or the other player, it makes me use that same army (Example: I want to use slot 5 and I want the AI to use slot 8, when I start the game both of us are using slot 8), I just tried the same random army mode on CEO Lab, not sure if it is correlated or something
Should be fixed now, it was the random mirror match mode from lab causing it, as you suspected.