Oh, no it is not "kitanai"!
Is the pot inside coated with teflon or something? When cooker is use for long time, the coating may damaged little by little, and the bottom part of rice tend to get grown.
This part is called "o koge" in Japan, meaning "burned" and though it is not served in restaurants or formal occasions, people do love okoge, and enjoy its nice, brown taste.
When I was small, my mother often make a tiny onigiri (rice ball) with okoge, a very simmple one only with salt. I really enjoyed it and hoped there had been more okoge.