Roman
Keymaster
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#10286 |

this issue happens, because of the sanitization of the field for the security reason, as per WP default codex. I can provide you a hack, which will allow you adding the symbol and get it worked, but you will need to update it manually after new theme release, or create a child theme for that. Edit this file in library/functions/options-sanitize.php line # 11

Code:
$output = wp_kses( $input, $allowedposttags);

change to

Code:
$output = strip_tags( $input, $allowedposttags);