Solved

Pit Crew Training Focus

What did you try to do?
Set the pit crew training focus to be skill or composure etc, save it.

What happened instead?
When I leave the screen, go to another app section and then come back, all the pit crew is set to fitness.

Did the problem happen while using wi-fi, mobile data, or both?
Both

Did the bug happen in the app, on PC, or both?
App

What is the model of your device?
Galaxy S10

What is the operating system?
Android

What is the version number of the operating system?
No idea

Can the bug be reproduced?
Every time I go back into the pit crew training screen.

Additional comments:
I set everyone to fitness the first time it was all available, its like its using that as default now.

Seems to have resolved itself for me now, but I'll be keeping my eye on it

edit-seems temperamental, can't work out what does or doesn't cause it to save

Mine saved once but never again.  Lost so many training credits due to training an attribute already at 30