My cars which I had in online mode are missing

I uninstalled the game few months ago and installed it back after few months only to find out that my cars from my online mode are missing!! , the cars which I had gotten by completing objectives and the ones which I won by doing lockdown modes all of them are missing, I can see those objectives and challenges as completed and rank remains the same but all of my cars are missing, please help me find them or help me with an alternate solution.