The donor from ticket https://wikimedia.zendesk.com/agent/tickets/1189252 - CID 18246037, mentioned donating via Paypal and not being able to complete the donation. I checked Civi and since seeing two completed donations, I confirmed them and offered a refund for the unintended one. The donor accepted which made me check PayPal and find out that both donations were "denied", something we have not seen before, while Civi still shows them as completed!
Transaction ID: 2TY21671Y2403350W for $3.10 AUD, OCT 10th.
Transaction ID: 2NY04199D7296470S for $2.75 AUD, OCT 6th.