Thanks for all the help. I was just about to factory reset it but i thought i'd play around with the settings first just in case theres something i've overlooked.
It turns out that somehow, the noise gate was on 10.00 and that was the culprit of the buzz / distortion.
I'm not sure how the noise gate got to that level, I have been having issues with the gain sometimes adjusting itself but it must be happening with the noise gate as well i think. Regarding that issue, I was advised by someone at Kemper to factory reset it so it looks like i'll still be doing the factory reset anyway but I just thought i'd update you guys.
Either way, this issue is solved!! I couldn't be happier (even though i feel stupid as something as simple as a noise gate was causing it).
Thank's again for the advice, there is a great community with the Kemper.