Lost cars from my collection

For a month and a half now, many cars have disappeared from my library and I had all the content, I mean all of it! I buy them and they disappear again, what do I do? I see both in Stream and in the game on Xbox for PC.

@x_MASSAKUATA_x please submit a ticket at Forza Support so they can look into your account.
https://aka.ms/forzaticket