[Plugin: Sharebar] Disappearing Shares

Greetings,

The number of Facebook shares on our posts often either disappears and goes to zero (when there were originally hundreds of shares), or falls way back in number. At times, we don’t really know how many times a post has been shared because the feature is so askew.

Do you know why this might be happening and how it can be corrected?

Thank you for any help you can provide.

http://wordpress.org/extend/plugins/sharebar/