Hustle Plugin Causes Icon Errors


I am working to implement the Hustle plugin on the Flatsome theme. However, when I activate the plugin, I get errors with the various icons on my site.

For example, I have many icons on the header of efowl.staging.wpengine. When I have the plugin activated, the icons all appear to be boxes. Screenshot -

If I deactivate the plugin, the icons display correctly. Screenshot -

Any idea why the plugin is creating a conflict with the existing icon set? Is there any way I can fix this?

Thank you,