I have been using this plugin for a year without problems until recently. I noticed about 2 weeks ago that the popular posts appearing are not the ones that have the most views recorded by the WPP plugin.
I have the settings set up to show the 5 most popular posts of the last 7 days sorted by total page views. However, if I look at the WPP stats page (for the last 7 days), my top 5 are posts that have respectively 8, 8, 8, 9 and 371 views. Other posts have much more views recorded and don't appear in the top 5 most popular.
I updated to version 2.3.6 yesterday, but the problem occurred before.
I haven't added new plugins or made any changes to the site around the time I noticed this problem happening. It's however possible that the problem occurred around the time we updated to WordPress 3.5.2
My blog url is http://www.teamblasecosplay.com
Thank you for reading this and let me know if you need more info.