I was trying to get the Social bookmark icons from AddThis.com for my new website http://www.farmingfunda.com
and was facing this issue.
This code suffixes some random string something like #.dfdEdf3d in the url after complete page loads. To fix this particular issue, you will need to set the above "data_track_addressbar" parameter value false.
Alternatively, you can uncheck the checkbox named "Track when users share by copying your URL" while getting the code from AddThis.
Hope this helps.