How to have two touch sliders operate indepently at the same time - slider

I have a mobile web app with two sliders a jquery roundslider and html/js slider acting as steering and throttle respectively. if I only slide one or the other then each works as expected. But use two fingers one one for each slider at the same time then the touch actions appear to interfer with each other. How can I get them to work independently at the same time.
Each slider is in its own div inside a split page. I am not using any dedicated ontouch functions just drag:function for the roundslider and oninput for the html/js slider.

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Please check out my answer here:
ScrollViewer: Disable Snap (elastic band effect)
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thank you
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