Hi @C--Jay0
First of all the link you've provided wont' work and it's associated with your login - if anyone else clicks it, they just get " you do not have permission to view this page"
I have had a quick look at your listing and I think I see the problem.
You have (probalby inadvertently) selected the option for guests to choose the non refundable option ( which over rides your cancellation policy) and pay less
To change, go to booking settings, scroll down to policies, go to cancellation policy and edit there - remove the option ( I can't quite remember what it's called, it doesn't show up on my listing as I have a strict cancellation policy, and it's only offered with flexible adn moderate cancellation policies from memory)
Sometimes it helps to search your own listing when you are not logged in and start to do a mock booking - you can see all sorts of things.
Hope this helps
Regards