When you race any race that has maximum potential for police encounter, a police chase will ensue sometime during the race. After the race you will need to get away from them so that the win and money won will stay. To completely skip this sometimes tedious process after a race, wait until you see the "auto-save" icon at the top of the screen disappear. Once it has disappeared (completed auto-save), hit reset and reload your profile. The race will show complete along with the money credits in your bank account.