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When a Notification is selected for a comment that's on the current page, the service automatically forwards the user to the location of the comment — but it doesn't automatically close the notification popup. The result is that the popup covers a part of the comment and the user must scroll back to the top to close the popup, then scroll down again to read the comment. At a guess, the popup is relying on the page redraw to close itself — but no page redraw happens when you're already looking at the page.