High gain capture issues?

I have a Super Crunch Box v2 that I’m currently making captures of, where I have successfully done some captures at both low and medium gain settings.

When I try to make a capture with the same pedal when set to high gain, the resulting capture seems to have lots of gain removed. Is there a reason for this and does anyone know what I can do to resolve this?

I’ve tried setting input 2 levels anywhere from 0 to +18db but the result is always the same; having quite a fair bit less gain than what the pedal is set at.