Is Your Slider Not Showing On Mobile Devices?
If you have noticed that your slider is not responsive on mobile devices, then chances are you have a "fallback image" inserted in page options or you have a missing image in one of your sliders. A fallback image is used to override the slider to show a single static image. A missing image can prohibit some sliders form running correctly.
1. Make sure you do not have ANY missing images in the slider, all sublayers/backgrounds that have images must have correct URL's.
2. Check for a fallback image inserted in the page options, it will override a responsive slider. See the image below for a visual representation.