HannahFink

Are there any recommended flexible build plates that work well with the Ultimaker S5?

I'm setting up my printer for the first time and want to check that the differing nozzle heights is normal. I installed the BB 0.4 nozzle on the right side of the print head when prompted, but it appears to sit lower than the AA 0.4 which was already installed on the left. Is this normal? Should I have inserted the extra AA 0.4 on the right side? What is the difference between the two?