Open one of your listings in HTML view and find a section that is under 1000 characters. (Sometimes, code added by different browsers at different times is not always identical, and can make find/replace a bit more troublesome). Thankfully, since the block of text was bulk added, the string should be identical in all the listings.
You should be able to repair your listings in bulk with eBay's tool, but the edit will be limited to 1000 characters per revision.
