Wolverine R leaking air from Huma Regulator weap hole

Hi all. Asking for knowledge and help.
This is not my airgun, it is one at my local AGS and they help me out and I would like to help them if I can.
Saw the wolverine R yesterday, when filled up the regulator leaks at this small orifice at the end of the silver regulator body.
I’m told that the reg is a Huma. I watched as the person there tore down the gun then regulator. Replaced the three orings on the internals of the reg. Filled with air afterwards, and the air bleeds out of that little hole almost as fast as it enters the carbon tank.

I am told they have torn it down three times now but always the same leaking result.
I have watched an AoA video on YouTube but it didn’t yield a clue.
I am not knowledgeable about regulated pcp airguns. Can anyone shed some light so that I can pass it along to the store owner?
Thank you kindly. Ron