The first three messages in http://ipod.macrumors.com are each visible three times there. The first 9 messages I see there today are:
Tim Cook: iPod is a 'Declining Business'
Tim Cook: iPod is a 'Declining Business'
Tim Cook: iPod is a 'Declining Business'
iPod and AirPort Roundups: What's Next for Apple
iPod and AirPort Roundups: What's Next for Apple
iPod and AirPort Roundups: What's Next for Apple
Staples Now Selling iPad, iPad Mini and iPods in U.S. Online Store
Staples Now Selling iPad, iPad Mini and iPods in U.S. Online Store
Staples Now Selling iPad, iPad Mini and iPods in U.S. Online Store
After that, messages in the archive appear once. I see this behavior whether or not I have logged in to the MR site. I see the same behavior in Chrome and Safari. I don't see the behavior in other product archives, but I haven't exhaustively looked at all the archives.
Tim Cook: iPod is a 'Declining Business'
Tim Cook: iPod is a 'Declining Business'
Tim Cook: iPod is a 'Declining Business'
iPod and AirPort Roundups: What's Next for Apple
iPod and AirPort Roundups: What's Next for Apple
iPod and AirPort Roundups: What's Next for Apple
Staples Now Selling iPad, iPad Mini and iPods in U.S. Online Store
Staples Now Selling iPad, iPad Mini and iPods in U.S. Online Store
Staples Now Selling iPad, iPad Mini and iPods in U.S. Online Store
After that, messages in the archive appear once. I see this behavior whether or not I have logged in to the MR site. I see the same behavior in Chrome and Safari. I don't see the behavior in other product archives, but I haven't exhaustively looked at all the archives.