I haven't been successful in finding that anyone else has this problem, but I may not be using the right verbiage.
Prior to one of the recent updates, when I went to the notification center, I could see my list of Facebook notifications, click on one, and then immediately, or even a few minutes later, go back to the notification center and they would still be there if I wanted to click on another.
Now, as soon as I click on one, they ALL go away!
Is there a fix? Anyone else noticed this?