6 12s in a single game.
It's not Catan Universe's fault, but boy this game can be shit. I highly recommend Stone Age for a more balanced game.
try rolling a pair of dice 36 times, record data. repeat four or five times. Now imagine repeating that hundreds of thousands of times. Yes you can get 6 or more 12s or 2s in a game. 11s seem to be real hot sometimes, but it happens in real life too.