The problem seems to be due to a plug-in on your website. Try disabling all mobile related plugins and Jetpack and see if that fixes this issue. Also check with HostGator to find out if they have a similar plug-in for client’s websites because when viewed in desktop, you do not have any link to HostGator on your website but it shows on mobile so maybe it has something to do with a HostGator feature. Let us know if any further assistance is still required.