If you want your time to show traction control = 5 go into the Nurburgring TT and change your TC to 5, click ok, do a lap (maybe not necessary).
Exit the TT and go to the Kart TT, set a lap, it will show TC = 5, like mine does.
But you wont have any traction control. Its just a glitch.
I wouldn't call it a glitch, it just records what you have set. It pretty much copy and pastes your settings and displays it for people to see.
It's is "glitchy" in that it's not perfect, it seems to record/display your previous settings sometimes.