Sonar Sensor Reading on Eddiebot

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I've gotten Eddiebot installed fully, I'm looking at the topics:

rostopic echo /eddiebot_node/sensor_state

I see the readings for the IR sensors and can validate they're reading in distance measurements, however the readings for both cliff_right_signal and cliff_left_signal go back and forth between 0 and 4. Both sonar sensors have the green LED on them flashing and I've tried moving the connector between a few different pins. Right now they're hooked up to slot 1 and slot 2 in the I/O part of the board. What slot should they be installed in?