#### php artisan serve keeps working even after i shut the process down windows

i am trying to stop serving one project and moving to another . but my php artisan serve keeps loading the old project . i looked every where there is no process of php running and i even deactivated all the services in wamp but yet again the localhost:8000 loads the site .
i know i may use this command php -S localhost:8000 -t public/ to server my project on other port but i want to know where is the problem and how to solve it because i want to switch between my projects a lot

Source: Laravel