The motor is a 3 phase bldc with 3 pole pairs, 3 hall sensors at 120 degree...
this is (almost, because negative) true for the currents.the information from the third sensor is simply the sum of the other two.
But you connected it with a cable (which isn´t an improvement ;-) ) to the PCB input of the hall signals.please do a measurement of the hall signals directly at the micocontroller input.
Your PCB GND is copper pour. Many small pieces of GND. This is by far not compareable to a solid GND plane.This makes me worry, because on that side of the pcb i have all the microcontroler grounds and adc/opamp grounds
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