inputs strange behaviour,

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hello,
i'm using 6 analogue pins of diecimela input 6 pots. works fine data pins 2 & 3 move in parallel, if pins hardwired.  if turn pot on pin 2, data changes on pin 2 , 3. seems data changed exponential, despite pots linear. when disconnect 1 of 2 pots, data shown in serial monitor comes linear; data pin 2 , data pin 3 still identical.
i tried put delay in loop, change pot values, tried put capacitor  between 2 pins, noting changes. input broken ??
thanks help

sounds pin a2 , pin a3 might shorted together.  check wiring.


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