It is possible that your website, once loaded in the Convertize Editor, displays a different type of font, or changes the size of your original content. Do not worry, this has not altered your website, it has simply changed for your view within the Editor.
To display the correct font and size on the editor of Convertize, you will need to whitelist app.convertize.io in your Adobe Typekit.
To add or remove domains:
Please note that even if your website is displayed on Convertize with some small differences, when launching a test, the website will display the correct format to visitors.