I find that this happens when I change my location, or my computer.
Another minor annoyance is when I receive a 'reply to subscribed threat' notification email, and the page starts with a post from the day before (or some time in the past). I always assumed this had to do with internet traffic at the time, or the reason listed above, and do the necessary scrolling. It's just funny that the correct post is in the email, but it does necessarily mean that's where the link will take me.
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