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May 2, 2021 at 8:30 pm #2295
the problem is hidden inside your full adder. You must bring your pins (input/output) at the bounding box edge.
In your full adder, the input pins are included in the bounding box making it not possible a direct connecting within the same layer.
Try using the attached one. Remember to replace all the black boxes within the CSA with the new one.