There's a 5.56% chance to roll any exact combination of two different numbers in each turn. That's not an incredibly low likelihood. You have 25 turns per game. The dice do not have a memory nor does mathematics have a memory. You rolled very unluckily in your game but this must sometimes happen.
The chance for you to roll at least one 3 on any given turn is 30.55%. So this is a quite large probability.
If my math is correct you should average roughly 1.39 times a 6/3 roll per game. That obviously includes games where you roll it 10 times and also games where you roll it 0 times.
So if you rolled 6/3 zero times or 20 times thus far in a game doesn't change the probabilites for your next roll.
If you would play enough games of The Castles of Burgundy you would also see a game where a player would only roll the exact identical dice rolls in each of their 25 turns

It's just a matter of how many games you need to play so that this would definitely happen
It is extremely unlikely to happen in a single given game but if you would play an incredibly large amount of games it would definitely happen.