Thanks for mentioning the KVM
You should probably connect the graphics card directly to the display (without the KVM) before you point your finger at the graphics card as faulty.
KVM configurations are notorious for adding ghosts. It's not necessarily the graphics card, the cabling or the monitor, but some combinations can prove impossible to view clearly without artifacts. In over 14 years of KVM use, I generally feel lucky to have a KVM machine display without artifacts/ghosts rather than feel unlucky to have one with artifacts.
Additionally, one VGA port is significantly better than the other on most of the 60+ NVIDIA cards that I've tested. YMMV.
I used to drive a Heisenberg, but whenever I'd glance at the speedometer, I'd get lost.