I could never get this one to "break". It looked fine to me at 800x600 and on up.
The one thing I can tell you is that in your code you have these &n b s p and templates hate those
For any other listings that you have in question (since the one you posted is closed) check your code for those rascals. There are a couple of other things in your description that could be the problem too but that is the best place to start.
Here are instructions for what to do to revise after you have made an HTML change:
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.
Might I also suggest pasting your code in Notepad or www.practiceboard.com to do your changes so nothing interferes or adds anything to your code.
Happy Listing!
Cara