Probably deleted posts a user removed after making.
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It happens when comment is deleted, or whole giveaway with replies is deleted.
Notification stays, but actual comment is not visible. Must be that notifications are not refreshed after they appear. They are removed only after you click on "mark as read".
So not really a bug, more like decision how they work. Otherwise site would need to constantly check all replies from all users and look for deleted ones to update /messages page. So I guess it saves computing power? I'm not developer though, just my idea :P
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It's a trade-off for performance reasons
https://www.steamgifts.com/discussion/J8KP0/new-message-notifications
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Twice I got a notification that there's a new reply, but nothing shows there? Is this a matter of deleted replies, or is there something more happening? (I have a notification now, but nothing new is showing.)
Edit: Looking at one potential thread, I do see a deleted reply. Perhaps it would be a good idea to remove the notification once the message is deleted. Either that, or show that there was a message and it was deleted on the replies page.
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