Hi benya121,
I believe the reason this listing is so wide is because the template stretched to accomodate the very large image you have placed directly into the description.
You should be able to fix this listing via the following process:
1) Locate your listing in your Saved Listings folder, make any necessary changes, and save.
2)Check the box next to your updated listing in your Saved Listings folder and click the “Get html” button.
3) Copy the html in the popup box.
4) Locate the item on eBay and click the "Revise Item" button.
5) Click "Edit Description" then click the "Enter your own html" tab.
6) Paste the copied html in place of what's there and save your changes.
In step 2, the necessary change you should make is to either remove the large image from the description or replace it with the same image after reducing the image size.
I hope this helps=)
-Mike