Missing cars in the game (Forza Motorsport 4)

I played, played fm4, and then I lost the cars that I need to buy (Porsche, BMW, etc.) I
go to the store in the main menu, I look at the sets of cars for purchase, I choose absolutely any, I press x and in theory I should all cars from this set will appear. But there is just an empty Slot, nothing at all, not a single machine
Reinstalled the game and confused 0
Help please