Hi Jon,
Did you check the Pin 1 designator of the IRF7103 package against your silk pin 1 designator? If the MOSFETs were populated incorrectly then the body diode of each MOSFET in the package would conduct between VCC_MOT and GND. This would also explain why removing the sense resistor opens the short you're seeing.
Did you check the Pin 1 designator of the IRF7103 package against your silk pin 1 designator? If the MOSFETs were populated incorrectly then the body diode of each MOSFET in the package would conduct between VCC_MOT and GND. This would also explain why removing the sense resistor opens the short you're seeing.