Assumed that you have no caching, probably you are using a mismatch URL when accessing that page with another browser/team member.

Metainfo are associated to each link, if links change metainfo change/won't apply.

If you specify metainfo for http://www.mysite.com/ and open http://mysite.com/ without www prefix they won't apply, it's a different link.

The same happens if you specify metainfo for links without SEF rewriting http://www.mysite.com/index.php/mypage.html and access them as http://www.mysite.com/mypage.html activating the Joomla SEF rewriting.

The same happens if you specify metainfo for links starting with https https://www.mysite.com/index.php/mypage.html and access them as http://www.mysite.com/mypage.html

Every time a link changes the meta data associations is lost. Keep in mind that the URL is the unique identifier for meta data.

Metainfo are an override system, they won't change the metadata in the Joomla article and database, yes this is by design.

Best regards

John Dagelmore