So I feel really stupid right now, but I recently owned a 6-car garage, and I wanted 2 more cars, but mine was full. I simply thought, "Oh, I'll just buy another 2-car garage and put them in there." (I use an old TV, so reading things is a little difficult, and I mainly skip over things.)
After I bought a 2-car garage, I realized my other one was gone. I am not allowed to buy it back anymore, even though I have enough money. Some cars transferred but not all, and some of the ones that I lost are worth a lot of money.
I can still use my old cars in races, but I can't find them anywhere else. I've searched for answers to this problem, but no one seems to have made the same lame mistake as me.