Sites are grouped by mistake

If your site is recognized as a secondary mirror of another site by mistake, let Yandex know that it should recognize your site as the main mirror or that sites should be separated.

A new site URL became a secondary mirror
In this case, you don't need to separate the sites. To include the new site in search, specify the site's main mirror.
A regional version of the site became a secondary mirror
The site became a secondary mirror of a third-party site

Contact the administrator of the resource that published a copy of your site, or its hosting provider and the domain name registrar. You can also use other legal means to protect your rights.

When the content becomes different, send a request to separate the sites in Yandex.Webmaster.