I changed one of my websites from Joomla! to Wordpress. It was a leader website on some important searches. But after changing almost every indexed pages deleted. I published the same articles on Wordpress but of course urls are different from the older ones. Now when I search as: site:sitename.com there is no problem. in some keywords it is still leader but only main page! when I publish a new article I see it is indexed but these pages are not listed on searches even they are unique articles. what should I do?