Hello ! I couldn't find if it had been reported or not, but whenever I click the "Go Back" button without choosing any track in Custom Championship, it still adds Brands Hatch.
Now it adds Bathurst instead of Brands Hatch. I suspect it adds the first track in alphabetical order, as I bought Bathurst just yesterday.
Richard says the developers are aware of it, so they will work on it at some point. As it's far from game-breaking, maybe soon, maybe not
I don't know if these are a known bugs, but : 1) I quit the game before a race, the game having saved my progress, but it didn't restore my setup when I started the race the next day (I noticed because I always run 100% brake pressure and it was back to defaults 95%). 2) The "Default settings" button does not restore the differential settings, they get carried from the previous race setup.