Second Slider doesn't work

Hello, I have cloned a slider and added my own images that I resized, but didn’t change any of its style nor settings, only the images.
When I copy paste the slider and add a combo class, the second slider doesn’t work anymore but the first one does.

The only custom code I added is smooth scrolling, there is another code from the cloned slider and I just removed the parallax effect of it.

Can anyone please explain ? Thank in advance !

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