The 2 numbers says 33…but the number on the screen for each tire is 36, 36, 36, 35. Sometimes when driving, it goes up to 38 (the numbers by each tire) but the numbers in the middle still says 33. It also gives the notification of “maintenance tires” but I’m not sure what to do
If I’m not mistaken–and I could easily be–the number in the middle is the recommended pressure, which is why it doesn’t change. As you drive, your tires heat up and the air inside expands, which causes the pressure to increase. This is normal. The “maintenance” message is probably telling you it’s time to rotate your tires.
Go back to the dealer and request an owners manual. Owners manual might be available online.