Share This stats being cleared

I’m having problems with my Share This stats. For about the last week, every time I go to my blog that stats located in the Share This block are different – sometimes being completely clear to zeros. For example, I had one post that had over 300 people share it and since last Friday it has been zeroed twice. what the heck is happening? Anyone know?

The blog is located at http://www.bassfishingarchives.com

Thanks for the help.