Peter here from Shopify Support!
I'm not entirely sure of this myself, however, I can point you in the right direction to finding an answer! The eBay channel is fully supported by a dedicated eBay support team who should be able to help get this resolved. You can contact them through one of their contact methods below:
If there's anything else I can help with please don't hesitate to reply back and I'll happily help out!
All the best,