I've just been catching up with leaving a load of feedback and I've realised after I hit send I've left incorrect feedback by mistake.
I bought a piece of clothing that didn't arrive and I opened a case, eBay refunded me. This was several weeks ago. It was sat there in my list of things I needed to leave feedback for. I went to the next item in my list (which was a similar item of clothing) and starting to complete my feedback for that item (all stars, positive, arrived in time, good ebayer etc etc). As I hit send I realise I completed it for the item that didn't arrive and I was refunded for.
I know feedback can't be changed but what do I do?