The country names on the registration page got mixed in 3 different languages (Russian, Kazakh, English)
Previously I had the installation which I deleted with three locales (OJS directory and DB), is it possible that there is some cache that I need to clean?
Make sure the locales are disabled for the individual journals.
Under Website → Setup → Languages for the journal, try selecting the dropdown arrow next to the primary language and select “Reload defaults”
If that still doesn’t work, you could try clearing out the composer dependencies for lib/pkp by deleting lib/pkp/lib/vendor and then re-run composer install within the lib/pkp directory. This will reinstall the library that is responsible for handling country names in case something strange had happened with it during the upgrade process.