I booked a hotel through booking.com and oon leaving the hotel I paid the bill. Now I see on my Activity page that booking.com is asking me to pay the same amount again.
I hope you enjoyed your stay at your chosen hotel. It may be that booking.com did not make the connection that you already paid. In my experience, they are very quick to respond so I would just send them a message to say that you have paid so they can resolve this for you.
