The site is using external content (aka from another website) to show those icons. The site is Fontawesome.com. Browsers may be set to higher security or using an extension that blocks external scripts which will block that from working. Admin should get all that code self hosted and not rely on an external site to handle UX IMO.
For those who are using good security practice, these are the minimum requirements for an allowlist for the site to function properly:
tcdb.com
ajax.googleapis.com
code.jquery.com
jsdeliver.net
and of course you can use the forums if you are blocking fontawesome.com but the buttons appear as dashes as noted.
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