Layslider images on mobile phone are small

I've purchased Jollyness several times for different sites. On one of the early sites I built the images used in the layslider home page slideshow display small on an Android phone and an iPhone (see link below). The images look fine on the desktop. I compaired my settings with another site also running Jollyness that does not have this issue but couldn't figure out the problem. I wonder if this module might have been updated although both say they are version DrupalExp Layer Slider 7.x-1.0-beta.

Thanks for your help.

https://drive.google.com/file/d/0B8nOwbP9I4U0NXFLdDJBRDNFMGs/view?usp=s…