Solved

Design points used but did not upgrade

Tried to upgrade car used 9 upgrade points on braking but did not upgrade
Happened on iOS app

Are you sure you didn't use the points on fuel economy by accident? I'm looking at your car design and there's a big jump between where your fuel economy design was during the previous race versus where it is now.

I didn’t notice that the fuel economy had moved but I’m sure I put it on braking. I will keep a check on it and report back if it happens again

Thanks Neil :)