Okay I actually just looked at the auction and I think it is an ebay glith myself!
I have had this happen at random to me as well and not from items listed with Auctiva.
If you'll notice the off centering problem is happening before your template starts, it is happening with the item specs box and that is ebay, not you or the template or auctiva
I have seen this discussed on other boards as well and no one can figure it out so when all else fails blame it on ebay