Hi white magic,
The Auctiva store window is programmed to finction specifically on eBay pages, which is why these 404 errors are generated when you click the items in the store window on your pesonal website.
However, you can make the store window finction on your external website by making a slight code change to your store window HTML. For specific information on exactly what change needs to be made, please read the following thread in our community forum: https://community.auctiva.com/groupee/forums/a/tpc/f/255609321/m/5051012061
-Mike