It seems that the k2_content module isn't showing the articles in correct order. If I have 10 items, and choose the module to display only 2 (ordered by "most recent first"), it doesn't show the 2 newest items. I have created one category, with 8 sub-categories. I have selected the top category as "category filter", with "fetch items from children categories" as enabled. This applies to K2 version 2.2 and Joomla 1.5.15.