I find out the error.
This happens because of Check & Log Email plugin.
Deacivated and now it works.
Hi bludesign,
I checked your link and your icons are showing up.
Try to clear your cache browser (or open in incognito), use another browser
If you have a wordpress plugin with cache, disable it, clear it.
I attached you an url with a printscreen to see that your icons are showing up (at least in my laptop)

Cheers