In my axe fx preset, there is only an amp and a cab block. Nothing else.
The gate is not the problem. It noises so much, that the gate cannot close proberly,
The actual amp sound is only a bit louder.
It is possible that it is the guitar, but it doesn't noise like this on my real amp.
There is always noise gate on the input grid (just as there is a mixer on the output) by default on all patches - have you looked at it's configuration? Did you try the classic vs. intelligent modes?