Dear Yana and Edvard,
We have some issue in our site, regarding the home button/link.
For some reason, we are using custom modul with links to some of the subdomains + the main page in english.
Our issue comes, when we click and enter some of the subdomain sites. Then, the link for the main page in english, changes to the main subdomain address where we are actually.
We had kind of same Joomla issue before, and fix it with disabled editor, which prevent tinymce to write not the full URL, but that's not work now.