OOP code doesn’t work for all sliders but only works for one

I have created an OOP file and applied it to 8 sliders but only one of them works OOP logic doesn’t work with that code

(https://i.stack.imgur.com/d6xba.png)(https://i.stack.imgur.com/jj9XD.png)(https://i.stack.imgur.com/QXazs.png)