Nintex Automation K2 (5.8.1) is a short term support release and represent additional features and fixes on top of Nintex Automation K2 (5.8)
Considerations and Best Practices for Custom Fonts
After adding a custom font it is necessary to refresh your browser for the new font to display.
If a custom font is applied to a View or Form and the web page where the View or Form is opened does not support the custom font, the font will revert back to the default font family for the browser.