I'm not sure if it is a bug or it is programmed this way at the moment but when you upgrade your car it does not update points available. So you will have to calculate the points you still have afther adding an upgrade or go back to selecting the car to see how many you still have available.
Example: Please select the category of the part you wish to add to your "name of car". You have 15 racing points available.
I have 15 racing points availble and i buy an upgrade from 6 racing points it will still tell me i have 15 racing points available when i have only 9 left.
My sugestion is to update this whenever you buy an upgrade.
I'm not sure if it is a bug or it is programmed this way at the moment but when you upgrade your car it does not update points available. So you will have to calculate the points you still have afther adding an upgrade or go back to selecting the car to see how many you still have available.
Example: Please select the category of the part you wish to add to your "name of car". You have 15 racing points available.
I have 15 racing points availble and i buy an upgrade from 6 racing points it will still tell me i have 15 racing points available when i have only 9 left.
My sugestion is to update this whenever you buy an upgrade.