Usually it's a skinpack or similar that is linked to the content (cars, most likely). Check for anything and uninstall them. Second and third options are to uninstall/reinstall the content, and remove the whole folder in Installed in between to make sure you have nothing weird. Fourth option is to check for any damaged mods (rfmod; 'event') that could be causing issues and removing them. Through the game itself, but also through ModMgr as sometimes things only show (or only show issues) in there. I think that's a starting point
