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Look on this page. Sometimes 2 have 2 subcategories in it (with the same name 
"Маршалы Советской Армии"), sometimes no subcategories at all. if you enter into 
the category page: http://ru.wikipedia.org/wiki/Category:Маршалы_Советской_Армии 
sometimes page is empty but sometimes contains 2 articles.

I cannot reproduce this bug on the supplied URLs.  This may have been due to the
1.4beta3 ru.wikipedia.org database upgrade that day (see bug 1154 and
http://wp.wikidev.net/Server_admin_log/Archive_3#23_December ), or 1.4beta3
problems that were later fixed.  Is this still a problem?

Ok, let's think it was a bug kust in this beta-version.