Im doing an e-commerce website for my school using MVC(Model-View-Controller),it is all made with html, css, js, and php (connection is made with mysqli), everything works fine, cookie, login, signup etc… the only thing i cant make it works are displaying the products from the db and displaying all the users that are also in the db in the admin page, query are right, the connection to the db is working since i can login and signup so i dont really know where the problem could be

tried some debugging, but couldnt understand where the problems are