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Less resistance when in a powered circuit? (Make: Electronics)

On the last experiment on page 23 (putting a 1K resistor in place of the LED) of "Make: Electronics" I'm only getting 1K of resistance WITH the potentiometer in the fully counterclockwise position. Turning it clockwise lowers the resistance (which should happen) but to a value below 1K. Separately both the potentiometer and resistor test fine but within the circuit and with power applied (6 volts) I'm getting less resistance. How can this be?
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