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They had committed to buy by sending an offer, right
Yes, he should not be sending offers while he has open questions. Asking a question after a best offer and final payment is irrelevant really as he's already committed. He might ask to back out and it'd be up to you. (although the way ebay works he'll just complain about something else and get a refund).
If he sent an offer with a message that said, hey, do not accept my offer if the answer to this question is no, or something, it'd be slightly different.
So really even though you made a mistake, he'd already committed. But we all know who eBay favours in a dispute so i'm not confident they'll take your side.
Looking for a bit of advice. I recently sold a Patagonia jacket on ebay. I had best offer enabled and a buyer sent me an offer, which I accepted. The buyer still hadn't paid after a day or so and then messaged me to ask me whether it had underarm ventilation zippers. I was on holiday and couldn't check so getting confused with another jacket I had, I said it did. It doesn't, I did genuinely think it did but that's irrelevant really.
Anyway I sent the item yesterday, forgetting about the zipper vent issue. It has turned up today and the seller has instantly sent a refund request saying I have deceived them by saying it had.
Am I in the right? They sent me an offer based on the advert, as it was described, no mention of underarm ventilation, which I accepted. They had committed to buy by sending an offer, right?