Roll20 has been behaving oddly ever since the new updates...I had about a week where my notification icon was displaying as though I had 2 unread messages where I actually had none, and I had to wait until the next time I got a message to clear the badge to all-read status, since the "clear all" button only shows up if you open the dropdown which itself wasn't opening because no unread messages were there to show. Weird stuff.