Icons not displaying

Hi, most of the icons I try to use on my BeTheme site do not appear. In the dashboard areas like BeTheme Options > Getting Started > Shop > Cart Icon, they appear as Chinese characters / square boxes.
When I view a page's source code after adding an icon, this appears:
<i class="icon- icon-">&nbsp;</i>
The site is running on Wordpress Multisite.

Do you know what the issue might be?
Thanks!

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