Listening to people who know him, he's always been eccentric, I'm guessing that now he feels free from the pressure to conform that's so pervasive in the midwest, at K-State, and within the basketball program.
Also his new coach seems to be a great fit for Carti, he will let his players take whatever shot whenever they want to take it as long as they defend and rebound. They were mediocre last year, but they've looked good in the two games I've seen them play.