Apple may be implementing some changes to the way that it ranks apps for its Top Charts in the App Store, reports TechCrunch, citing studies from a number of app analysis services. It appears that new factors, such as app ratings and user engagement, could be influencing app position and preventing developers from artificially inflating the rankings. According to app marketing service Fiksu, app rankings began fluctuating in late July, favoring apps with ratings of four or more stars in the App Store. While those apps jumped to higher positions without a corresponding increase in downloads, apps with poor ratings saw their rankings fall.