Sorry for the issues you are having.
Are you saying that the H90 powers up and works correctly with the included power supply, but now it is having issues with a different power supply?
If the H90 isn’t working properly with the included power supply, please contact email@example.com and we’ll help you get sorted there.
If it is only having issues with the GigRig power supply, that would indicate an issue with that power source.
The levels settings on the H90 will not cause an issue like this.