Have you opted to hide selected NA icons?
R-click on a clear bit of the NA and select Customise Notifications... and see how it's set. The icon in question will likely be in the "past items" list rather than "current items".
Microsoft Surface Book 2 15in review
Iglooghost's hyper new music video gives a mutant take on Monument Valley
When is the best time to buy an iPhone?
Quel antivirus gratuit choisir pour un PC ?