Problem with font awesome

Thanks for reporting the problem.
I’m not able to reproduce the problem on my test sites using the latest version of the plugin.
Make sure you did not checked jQuery performance options ( see here : https://docs.presscustomizr.com/article/414-nimble-builder-and-website-performances )
I recommend following the troubleshooting steps listed on this page : https://www.ads-software.com/support/topic/troubleshooting-tips-for-nimble-builder/