Solved

Perfect Setup Suddenly Changed

What did you try to do?
Nothing. Setup both cars perfectly in dry. Came back into game later and both drivers now said wing and ride not perfect. Previous settings had saved and no further changes were made.

What happened instead?
Drivers opinion changed despite them saying the last lap was perfect setup when it was saved.

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?
Huawei P20Pro

What is the operating system?
Android

What is the version number of the operating system?
9

Can the bug be reproduced?
It's still there. Got the setup perfect. Saved. Came back an hour later and suddenly not perfect. Only difference is slight rain now.

Additional comments:
Has happened more than once.

Hi when it is actively raining you have to do a wet setup

Definitely not a bug. Setup changes depending on weather condition (typically, you have a dry and a wet setup. I heard there were a setup for very heavy rain or snow, but I cannot confirm)

Hi @Gary

These are not bugs. I move the thread to #help & support.

The configuration changes according to weather conditions.

Thanks for the useful input everyone. I understand better now and will keep 1 or 2 practices spare until closer to the race if there is a chance of rain.