There are numerous cases where people are having success with ExpBountyHunter's suggestion, first try clearing out the notification on a web browser, clear your cookies/cache on the same browser and signout/back in. Sign out on your mobile device and then back it. If it's still persisting after that, please fill out a [url=http://www.bungie.net/en/Clan/Post/18405/64336073/0/0]Forum Bug Submission.[/url] Thanks.