That sounds like a plugin or theme conflict. Can you try and gather as much information for us as possible? Please perform the following:
1. Check for conflicts.
2. Check for JavaScript errors with your console.
If you find any JavaScript errors related to Yoast SEO or if there is a conflict with a plugin or a theme, you can create a new GitHub issue for our developers. Please report the issue to a third party developer as well.
If you didn’t find any conflicts or errors, we think the issue is specific to your site. We’d need to investigate further but are unable to do so on these forums. You can purchase Yoast SEO Premium and receive our Premium email support and we can help you further.
Проблема не в теме а в плагине W3 Total Cache. После отключения удалось поставить имя. После активации имя пропадает опять.
The problem is not in the theme, and the plugin “W3 Total Cache”. After disabling the plugin, I managed to put the name. After activation, the name disappears again.
Thanks for confirming that the W3 Total Cache plugin was causing a conflict. We would recommend also reporting the issue to the developers of the W3 Total Cache plugin here: https://wordpress.org/support/plugin/w3-total-cache/
We are going ahead and marking this issue as resolved due to inactivity. If you require any further assistance please create a new issue.