Hi Phyllis,
There is most likely some extraneous HTML code or an extremely long URL in your description that is causing the description text not to wrap properly and therefore causing the template to expand horizontally, however, we would have to look at the actual listing that exhibits this problem to determine the cause with certainty.
If you are still experiencing this problem, I recommend contacting our customer support department using the appropriate link on our help page:
http://www.auctiva.com/free-auction-software-help/help.aspx-Mike