If the data is read from the database, please note that by default, database connections on our hosting do NOT use UTF-8 encoding, but latin1 instead. So if you enter special characters through phpMyAdmin (which does use UTF-8 connections) and then display it on your site, it will appear garbled. The same is true if you do the reverse (write from your site and display in phpMyAdmin).
The fix is simple: you need to specify the connection character encoding in your PHP code.
If you use MySQLi: PHP: mysqli::set_charset - Manual
If you use PDO: PHP: PDO_MYSQL DSN - Manual