I'm with the OP on this - last three bookings have all had exactly the same conflicting terms. I think the reason is that they only have a limited number of "headers" for the rate categories - Standard, Deals & Package and Pre-Pay & Save - and that within that last category are rates that are both refundable and non-refundable depending on the specific property, dates etc. This was the language that seems to be at the heart of the issue from a dummy booking I just did and this seems to be where the confusion is - the first and second bullet points seem to be at odds with each other.

Cancelling Your Reservation

• Changes to your reservation are not permitted. Please note that you may cancel your reservation for no charge until October 10, 2019.
• Please note that your prepayment for this special rate is non-refundable