check the option 'Mark item read after <S> seconds' in Tools | Options. Default is 2 seconds. If you are too fast with moving to another feed item, then the previous one remains unread/new. Set the option to zero and it will be marked read immediately.
Sometimes I have a similar problem: When I open an item it is sometimes not marked as read (no update at the same time)
Workaround: Close item and click the item again an then it is marked as read.
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