Please also check you and the rest of your team have the latest version of the AI mods installed on each day of the tournament. In the case of M27AI and M28AI, while I do not expect any updates to M27AI (assuming no major bugs are discovered in the next week for it), M28AI will be receiving a small update ahead of the tournament start date (and might receive an update inbetween the first and second weekends).
If players have different versions of an AI mod when starting the game it will be highly likely to cause a desync, so don't just rely on the the client automatically downloading the latest version when joining a game.