Enfold icons not displaying properly?

Hi,

I noticed before on one of my websites that it was returning a security certificate error and trying to stop me going to the site, then when I did the styles hadn’t loaded at all. I then went to /wp-admin/ and it was requesting an update for the current version of WordPress, which I did and it worked successfully, fixing the security issue and making the site look better again, almost 100%.

But, now the icons (enfold fontset?) are displaying like boxes and Chinese characters what’s wrong?

I’d have no idea where to start resolving the problem since I haven’t changed anything, apart from the update.

Thanks