I notice this too, but found that this is ok. Take a closer look to the IIP Control Panel. You see that top x poster for y time. And this is the trick Set time to 5 days and see only the top x poster for the last 5 days.
Then watch for the excluded boards for this box. This will not counted too.
As far as I know this box work correct if you have this settings in mind. I set it for top 5 in 7 days and change the title of the box to let the people know thats only for the last 7 days.
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Set time to 5 days and see only the top x poster for the last 5 days. 
