Parallax Dynamic Effect not working

This is the code that I am using on this page – https://www.questadvertise.com/get-exposure/

[content_break][section color=”color1″ pattern=”yes” pattern_url=”https://www.questadvertise.com/wp-content/uploads/2014/02/parallax-bg101.jpg” parallax_type=”dynamic” parallax_scroll=”0.25″ parallax_duration=”750″ parallax_easing=”easeOutExpo”][headline tag=”h1″ color=”color4″]Take Your Business to new heights![/headline][/section][/content_break]

However the dynamic effect is not working, could you give me a possible reason for this issue?