I can't see a problem on your site actually. I've attached a screenshot showing how the icons work. It's CKEditor, and it's using sprites. Each icon is a part of a shared background image (icons.png), and then given a vertical offset into that image to select the right bit for the icon.
All I can think is if somehow cloudflare optimisations are causing some kind of issue, or perhaps some kind of browser plugin.
(Click to enlarge)
(Click to enlarge)
#2365 - WYSIWYG has incorrect icons on the buttons
All I can think is if somehow cloudflare optimisations are causing some kind of issue, or perhaps some kind of browser plugin.
My screenshot is for the Link icon.