Why is my seller rating less than the number of seller feedbacks I have received?

[exquisitedelight2014]

I have a seller rating of 68 (the number next to the star) yet I actually have 76 positive seller feedbacks and no negatives.  Why isn't my seller rating 76 then?? 

[phorum_junkie*]

If you receive multiple feedbacks from the same member for items purchased within a 7 day period then it only counts as one.