The Page Navi plugin is generating page URLs with search queries from users at the end, like this:
A similar issue has been brought up before here, where it was attributed to Google Analytics, malware and / or the Super Cache plugin, but I don't use Google Analytics and the blog is malware free.
I do use SuperCache but its developer Doncha believes the problem is with PageNavi.
This is a real problem because it is constantly changing the URL of the page and therefore is wreaking havoc on SEO.
Any help will be greatly appreciated.