Button image problem

The plug in works most of the time, but I’ve been noticing that the button sometimes looks like a portion of the admin screen. Here’s a screen shot:

http://cindigayrughooking.com/oldSite/delete-screenshot.jpg
I am putting the button at the top and bottom of the post.

Here is a link to a post: http://cindigayrughooking.com/whipping-tips/

http://wordpress.org/extend/plugins/pinterest-pin-it-button/