Target Audience in Webpart not working properly

I have added an AD group as target audience for CEWP in a page. For some users of that group able to view the webpart and some are unable to view. As i checked both users have same permission for the site given.

But why the issue, where as same permission level is there? Need some hints. Even after adding those users(who are unable to view) in a sharepoint group and given that group in Target Audience; same issue.