Yes. He was associating the hose routing of the SPG with the hose routing of your 2nd stages....the 2nd stages traditionally route from the 1st stage towards the right hand side of the body....in your picture the SPG hose is aligned with the 2nd stage hoses but you 2nd stage hoses are on the rotating turret past of the 1st stage....When the reg set is mounted on a tank you will rotate the turret so the 2nd stage hoses route to your right, and the SPG hose will be routed towards your left. It just didn't initially register in his mind that you have rotating turret 2nd stage, when prompted to look a 2nd time he noticed it.
All is good with your setup.
-Z