@Matt45 I think you're the victim of an AirBnB "beta" test gone awry. I say that because I've never seen the ability for a host to set general weekly or monthly rates. Instead, most hosts can set weekly/monthly percentage discounts. Your listing, on the other hand, clearly has general weekly and monthly *rates*, not discounts.
If I were you, I'd get in touch with AirBnB. First, I'd describe the issue you're experiencing. Second, I'd complain about being an uniformed guinea pig. They need to hear that, as they do it ALL THE TIME. (I know this from personal experience AND from insider information.)