NRF52833 GPIO default state

I am checking the voltage of my NRF52833 DK and I am getting 2.9V in some of my GPIO pin. Adding to it I didn't feed any program to make that pin to High state. I want to know whether the default state of any GPIO is high or Low. If the answer is, it can be any of the two state then explain me why only particular pins are in high state in default.

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