How to fix leader stats local script bug?

I'm making a GUI car shop, and it all works perfect except for this tiny detail which could create problems when I work on the save script to save the cars after you buy them: When you buy the cars, since it's a local script, your money only goes down on your screen. For everyone else the money stays the exact same, so when you re-join the money would be back to how it was or if you buy something which isn't a local script or earn money, it'd go back to normal + the amount which was taken away/given. Is there anyway I can fix this?