If you refund, while still on hold, ebay requires funds from another source usually money already in your ebay account or bank account, and when they send you details of refund they show details.
I would guess that refund was made from your cleared ebay balance if you can see it.
I have twice recently refunded small overpayments of postage, on same day received, before being released and ebay just took from funds already on my ebay account.