Some of the Kendo UI font icons unicode numbers are reserved in iOS (e.g e007, e006, etc. ). Thus, with the current implementation of the Kendo UI themes, before the font is loaded, the default icons corresponding to these unicode characters are being displayed. This is especially the case with a slow network connection.

A suggestion to handle the issue is to use a font loading strategy that renders an invisible fallback font face, or a font face observer.