Matt wrote:
.... device, OS, and browser you're testing on
Without OS versions and Browser versions we can't pin anything down... I tested on a physical iPhone 5s (not emulation software) using the latest Safari and your homepage renders fine... with some slight transition glitches in that slider...
Matt wrote:
... your Layer Slider widget isn't terrible mobile friendly....
Try disabling/unpublishing that slider...
Try clearing out your device caches...