Icons have changed their appearance

Hi Guys
Could you help with the following please.
Site: http://www.momentumsnowsports.co.uk
1. Icons on contact page, arrows on homepage slider and mobile menu have all gone wonky, although some function.

I’ll ask the following questions on separate threads, but thought it might help you to know that I am getting the following messages.

1. the following message appears on theme appearance page; “Warning: Invalid argument supplied for foreach() in /web1/user53142/website/wp-content/themes/enfold/framework/php/auto-updates/class-pixelentity-theme-update.php on line 49”

2. when I try to preview any page I am working on, I get the following message “You do not have permission to preview drafts.”

Thanks in advance.
Cheers
Keith