Hello,
I have the same problem with the S5 “ultimaker s5 difference between height of both print cores exceeds realistic value” , when I do the manual bed calibration the right nozzle sometimes does not touch the bed, it returns 3-4 mm above the bed there is no problem with the left nozzle, after 3 times the right nozzle will go lower and then there is no problem. Also calibrated the switch that will lower the head.
Best regards,
Günther