Nitro 6000 psi problem

Not sure if I have a complete grasp of set up and maybe some physics, but if I’m not mistaken JB valves have a feature where when filling your gun FROM the guppy there is a, I’ll call it a poppet, that only allows very slow gas flow to exit guppy so you have a nice slow fill rate rather than inadvertently slamming the gun tank. But when FILLING the guppy the poppet moves a bit to allow a much higher flow rate. It sort of sounds like maybe the poppet is stuck in the “filling the gun position” and the gauge is seeing the pressure in the fill line and not the tank.
Just a SWAG as to what might be going on.
 
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