why is rover is not applying my house sitting rate properly?

This sounds like something you need to resolve with Rover Customer Support. Give them a call at [Edit: Rover’s contact options have changed. Visit the Rover Help Center at https://support.rover.com/ to find the phone number, help articles, or chat with the team]. I took a look at your rate table and couldn't find anything amiss that would affect the scenario you described. There was one oddity, though. Under drop-ins, the rate listed for bookings of 9 days or more is $100 per visit. That's probably not what you intended.