I just noticed that this plugin works fine in Chrome and FF. However, I just checked it out in IE and see a major problem. The bar is right in the middle of the page. Scrolls fine, but it starts in the middle as if it didn't get the left side positioning.
I figured it was a problem with my blog, but when i visited the plugin creator's homepage (http://devgrow.com/sharebar-wordpress-plugin/), I have the same problem. This is a little different. On this page, the plugin starts in the right spot and then when I scroll down the page, when the bar hits the top of the page it jumps to the center of the page from the left.
So, it's not just me.