PineGrow not loading glyphicons except in browser view

Pinegrow 3.1 is not loading glyphicons within the application

However, When I cick “preview page in browser”. It loads the glyphicons successfully

Consider the screenshot below of how glyphicons are displayed in pinegrow as compared to the browser

Are there any settings/configuration that I need to enable pinegrow to properly display glyphs within pinegrow ?

After a quick test with PG v3.1, I found is no issue with glyphicons display within the app.
I guess something is missing in your document. Please contact the support and send your project file.