I wanted to give my solution to an issue I had with my buyer because it might help someone else. My buyer bought 2 quantity of my listing through global shipping because he is in the Philippines and I am in the US. Unfortunately as he tried to pay he could not and received Error 80003 saying 'The seller does not ship to your location. We talked to eBay support and eventually we found out the problem had to do with the order being more than 1 quantity. The solution we found was to cancel the order, and relist the item as a lot so in the eBay system the order only counts as 1 quantity.
Hope this helps someone!