How do i fix the spawn when i join my game?

For some reason when I play my game it sends me to a empty gray world...….. And it doesn't send me to the right place that I made! It sends me to a different world. A different base plate. And when I test it works. So I made my game public and when players join it sends then to a different baseplate that's not my game, A gray empty base plate. Check it out and see https://web.roblox.com/games/3255432397/Jim-Happy