Its car (Forza Horizon 4)

Let's say we run weekly tests. And in one of them there is a type of machine, they say should be a machine worth 2,500,000 credits. I have such a car, but when I start the test, I do not have a car, and when I buy a car, and there it is, that is, to buy it again, although it is in my property. How does it work at all?