Unreproducible

Parts at 0

What did you try to do?
Nothing

What happened instead?
All my parts disappeared

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?
PC

What operating system is your PC?
Win10

Which browser did you experience the problem in?
Chrome

Can the bug be reproduced?
Dont know

Additional comments:
Yesterday I had just over 1000 parts... Today I have 0. Wtf???

It happens regularly that your parts show as 0 after repairing the car, you don't actually lose them its just a visual bug, go to a different screen then back to car and they will show again. It has been like that for months now, I can't remember which bug update it was part of or what it was they were making worse when this feature was added.

I don't think I have screen record on this phone plus I am down to 865 parts, it happens when you have over 1000 parts, the game gets confused as 1000 is supposed to be the limit.

It's just a visual bug, I also get it when repairing the car before the race. In particular, after repairing the second car, the count of the parts gets to zero. When I refresh the page, it shows the right number of parts again

Yup they're back again now.  Thanks guys.