So far, you have received a total of 2,477 feedback and have left 2,566.
Your feedback rating is 2,101 which is normal since multiple feedbacks received the same week are counted as "one" only in the rating. For example, in December 2013 you received two positive feedbacks from the same seller. While "2" will be included in the total count received (2,477), only "1" will be added to the rating (2,101).
To learn more about how feedback works, please take a look at:
http://pages.ebay.ca/help/feedback/allaboutfeedback.html
Good Luck.