I think Mork is right. I've seen similar things myself. It has to do with browser caching behaviors. F5 or control-R should fix it when you're seeing it when you think you shouldn't.
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Tiny Hero Game Studios
Makers of "Land of Legends"
hm... I tried refreshing, using different browsers, different computers... it still says I have a message, but nothing shows up on my message list when I open it.