… You must mean that the one on the left is correct and the one on the right is incorrect - the cars with the title screen look good, while the others… Not so much. The runtime add-on isn’t really finished yet, and I have been having problems with it as well. Make sure you create the game without a ‘.exe’ on the end. After you run the add-on, check the console to see what printed out; perhaps there’s an error.
I also ran the game with the BPPlayer, and the same thing happened. I had no problems shown in the console, and i double checked that all my textures were packed. The cars both have reflective textures on them, but the island doesn’t so it’s most likely not the reflective textures. Also, the overlay with the text on it isn’t showing up at all.