The bot teams is happening to alot of players. I played bot in matches 4.2, 4.3 and 4.4.
I'm not sure why. My guess is a shortage of available opponents. I think most managers either aren't taking the time to get the tickets or aren't winning against the overpowered bot teams, so their is a shortage of available real opponents at the later stages. I'm not sure though, just a guess.