This is weird, there is a massive amount of feedback coming from my Amp only when I'm plugged into the GNX3

I've tried both of the cables I have separately going from Guitar > Amp
neither have the problem, it's not my amp, my guitar, or my wires.

It's the GNX3, does this happen to anyone else? If so do I need to do something? Like upgrade the firmware?

Also, My volume is set extremely low.
And I have to blast my amp to the maximum to get something at least audible. And I know that's not right, because I can still hear my strings when I went all the way to 11 on my Amp.

I mean I got this yesterday, and I know that it takes awhile to get used to the controls but come on. It's not supposed to be happening like this.