Kerbal Space Program

What happens: When landing on the Duna, I can research only one biome - "Duna's Surface". It's shows when i using everything: from "Crew Report" to "Matherials Bay" and taking "Surface Sample".

What i do:
• Orbiting to Duna shuttle with Lander;
• Landing once on exemplary coordinates:

0° 5' 11" N
47° 18' 12" E

• Return back to station on the orbit.
• Try to land on other biome.

Notes:
• I've done a number of attempts of searching other biomes.
• Now, while the game says me that the giant north polar cap of planet is just a "Surface" (Means biome), I sreenshot and put it here.