I Just restored the backup and its working as before, not errors.
But you could have seen it in any page of the website, it was everywhere, and as I wrote before, the error was:
Warning: Attempt to read property "fontFamily" on null in /var/www/vhosts/zentronaturalmente.com/respiracionsomatica.com/plugins/system/helixultimate/src/Core/HelixUltimate.php on line 1228
Warning: Attempt to read property "fontFamily" on null in /var/www/vhosts/zentronaturalmente.com/respiracionsomatica.com/plugins/system/helixultimate/src/Core/HelixUltimate.php on line 1230
Warning: Attempt to read property "fontFamily" on null in /var/www/vhosts/zentronaturalmente.com/respiracionsomatica.com/plugins/system/helixultimate/src/Core/HelixUltimate.php on line 1243
Anyway it is disturbing that the IG social icon is flawed like that.
I finally used your css trick but in the twitter icon instead of youtube