thank you for the answer,
the code is already there, but only this plugin is OK. The same problem is valid in yoast seo. https://www.haberver.me/news-sitemap.xml
this character gives hex problem only for content from one site. I think because windows word copy and paste is done. my problem is i will need a code that makes hex to unicode in the title.
ok edit wp-config.php
search:
define('DB_CHARSET', 'utf8');
Replace:
define('DB_CHARSET', 'latin1');
or
search:
define('DB_CHARSET', 'utf8mb4');
replace:
Check if the rare signs still appear.define('DB_CHARSET', 'utf8');