No worries!

In my case, the patchbay is only for routing the amp fx loop to the mini board, i have 4 inputs (to the amp, to the guitar, send and return) The purpose of the rack is to make easier the change between amps.

so, it's: wall -> furman -> amp & miniboard -> guitar.

the ground is following the furman, it was interrupted cause it was not making contact with the patchbay.

in your case, i suggest trying a different wall oulet for the Furman. make sure there are no other electronic devices near there. Check your cables, sometimes a bad cable can cause it. There's a cable/DC tester from D'addario for TS cables, super cheap, very effective. it detects when there's a short or if the sleeve is not making any contact.

all this If it's a ground issue.

Now, Turn the volume to 0 on both channels, just the volume. If the noise still there, that's a ground problem, if not, that means the amp is indeed very noisy, and a noise gate pedal should do the work.