I refunded my customer through PayPal now eBay has refunded the customer again

On the 14th of April I issued a refund through PayPal to one of my customers and they returned the goods to me. Then on the 21st of April eBay said a case was opened for that return.
Now on 2nd of May eBay are saying
Case #5229271246 is now closed You'll see the amount of £25.00 for case #5229271246 (for item Vintage Oil style lamp with two large glass shades ) on your next invoice. We refunded Ada.geo and closed this case. What does this mean as I refunded her on the 14th April. Will she get a refund twice. Because it looks like i’ve been charged twice. Please help what shall I do next.

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How did you refund? If you didn't refund through the actual Paypal payment it won't be recognised as a refund and the buyer can still be refunded again through the case they have opened.