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Hi, I see someone recently reported a similar issue, appears to have been answered, but can't see the answer - so, apologize for asking a similar question:
Thanks for your help!
If a buyer paid an invoice that you sent them and the payment did not complete, you would see that on the transaction details. I see you've stated that you only see one payment that has completed within your account. I suggest having the buyer reach out to our Customer Support in order to see why they may have been charged twice.
They can contact our Customer Support by clicking 'Contact' at the bottom of any PayPal website page to view available options. They can also reach out by sending us a private message on Facebook or a direct message on Twitter.
I hope this helps!