Hi @Robert341,
Welcome to the Community Center! Your guest has been refunded according to your cancellation policy - as you then decided to give him an additional refund, that will be deducted from your next payout (as you were told). Hopefully you will be able to rebook those dates so you won't lose out on that money, but you will not receive a payout for this reservation, as you have issued him a full refund. This Help Guide explains what happens when your guest cancels.
I hope that makes sense.
Just to let you know, I have moved your post here to a new thread so that it doesn't get lost in another discussion. I have also given it a title, please let me know if you want to change it!
Kirstie