How to solve the problem of RDC6332NM controller not resetting to the origin?

Try resetting the z/u axis to remove the enable and see what happens?

I suggest you check if the machine's size and step distance settings are correct, and also check if the limit is normal

Check if the zero return direction setting is correct. If the direction setting is reversed, the machine will return to zero in the opposite direction and will never touch the origin switch.