Active Directory and Share Point User List Sync Up

Share Point site collection only sync up the active user information in the user list.An active user is someone who has "contributed" to a site by doing more than just reading the content.  They have either uploaded a file or created a list item or changed some piece of metadata.  So if the user has only read information in a specific site collection then their updated information in their user profile will not be synced to that particular site collection.  The only way to fix it is to either remove them from the whole site collection and re-add them or have them change somethign on that site collection and then wait a couple hours

To sync the user profile information manually use below steps

Manually run the timer job - User Profile Service Application – User Profile to SharePoint Full Synchronization:
Open Central Administration
Click Monitoring
Under Timer Job, click Review job definitions
Click User Profile Service Application – User Profile to SharePoint Full Synchronization
Click Run Now