This happened previously and seems to be returning. Here is what seems to happen:
I login, see a new post has been made, click the bell icon on top right, and right-click to open another tab and return back.
Each time I do this however, the bell notification keeps saying 1 new still active. Even after clearing all the messages? I still have 1 new.
Login in on my phone however, and it doesn't display it at all.
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log out, clear browser cache, log back in. Works for me