I think I know the problem, I had it before and I learned the hard way to resolve it. Its NOT the buyers fault or PayPals fault. Its the sellers mistake. Its either a mistake or spam by the seller. The sellers eBay and PayPal accounts do not match, for example the email address is different. Its kind of a safety procedure to avoid payments if something is fishy. To my experience it was a spam in eBay but I cant confirm this to all sellers with this issue. Hope this helps.
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