It is common that websites use URLs query parameters or session ID parameters that are not relevant to data analysis (unique ID, meaningless parameter). You can easily ignore a number of parameters from the URLs, and prevent them from appearing in the “Actions > Pages” report. Login as the Super User, go to Settings > Manage Websites > Global list of Query URL parameters to exclude field. Each Piwik admin user can also exclude query parameters for specific websites, by entering them in the Excluded Parameters list for this website, in Settings > Websites.