Comment by sohkamyung

I did some more testing and I think it's due to how Windows interact with the website slider.

I've tried with Chrome on Windows 10 and find that the slider works but only if I touch on the line the slider is sitting on to set a value. Attempting to tap on the round circle and pulling it to slide does not work.

I tried again on Firefox and if I very carefully tap on the line, I can set the slider. But touching the circle and sliding does not work. So, Firefox is more sensitive than Chrome when it comes to determining whether I am touching the line or not.

I presume this is due to how Windows interprets touch events and passes them on to the browser, making the sliders hard to work with in my case.