Now don't kill me if this proposal is too stupid, but is your guitar actually connected to your Kemper? A few days ago that happened to me, guitar was plugged to my interface, so I heard some (clean) sound but of course no changes when tweaking the Kemper. After I'd found out I felt pretty ashamend and I swore to myself never to tell ANYBODY about that, but maybe the same thing happened to you?
Hey buddy.
Not everyone from Czech republic are stupid:-)
I don't want claim you are stupid !!!
But thank you for you confession:-)