I started today in the GC with my progress showing 24.7% completed in Div 9. I took the Brain Twist and got all the questions correct, upon returning to the GC my progress still showed 24.7% (rather than the 25.1% that I expected for a successful BT progress in Div 9). I used the back button to confirm that the before and after BT progress was the same. I took one of the double starred categories and got 13 correct and my progress then showed 25.0% which would be the expected result.
I've found that it takes 5-15 minutes for the percentage to show progress when a lot of people are playing or if I play durning the 60 minute update for the top 100 list.
But it seems you are saying that you didn't get credit for the Brain Twist.