They all look low, you need to pump up the rears up to 36 psi for the light to go away.
Once your air pressure drops below the low range, usually 5psi or so below the recommended pressure, in this case 36 psi down to 29 psi or so, you will get an alert.
However, the alert will not go away until you get the pressure back up to the recommend psi, in this case 36 psi. They can drop again 3-4 psi without the alert going off, but once triggered (5 psi or more low), you must go back to the full psi recommendation, even 1 psi less won't reset the warning.