Solved

For two days in a row, my setups have reverted back to defaults

What did you try to do?
Tried to set up for the previous two races in FZOffline at between 10:00 and 11:30BST.

What happened instead?
It saved both times at the indicated times.
When I looked at my results I found that my setups had reverted to the default setups.

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

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

What is the model of your device?
Samsung S10 5G

What is the operating system?
Android

What is the version number of the operating system?
Cannot remember right now

Can the bug be reproduced?
It did happen for two races in a row.

Additional comments:
Was there any kind of work going on on Sunday or Monday that might have caused this?

Just to let you know that rveryyhing went through properly for Tuesday's race.