Vertical glitches like that is often something going on in the monitor instead of the computer -- basically glitching occuring related to the LVDS ribbon cables to the LCD panel glass between the TCON (timing controller that refreshes LCD pixels) and the screen glass.
Often the widths of the glitches are approximately 1/8th screen width or 1/4th screen width, and it looks like the rightmost band is being effected, and the horizontal spaces between the ghost images is also similar spacing. So your two glitches are related since that's the segmentation of the refreshing system becoming visible -- modern LCDs are often subdivided into vertical strips independently refreshed by separate ribbon cables in perfect sync. If one glitches, that creates band widths or horizontal-shifts (e.g. duplicate vertical columns or ghosts) equivalent to 1/4th screen width (4 channels) or 1/8th screen width (8 channels). That's a dead giveaway of a glitch inside the monitor, not inside the computer.
But two different samples? I now have a theory;
Longshot (10% chance) is an RFI/magnetic interference of a poorly shielded monitor.
Could you do a test -- and relocate the monitor further away from electronics, transformers & gadgets?
-- Move routers very far away from the monitor
-- Move computer another foot away from the monitor
-- Move all transformer boxes off the desk
-- Move all power bars off the desk (if any sitting on desk under monitor or behind monitor)
-- Move monitors further away from the wall at the back (e.g. power wires hidden in wall behind monitor)
-- Move all antennas further away from the monitor (TVs, radios, routers, phones, etc)
In simple terms when testing for interference-related issues.... Put at least 2 feet of "no-electricals" space in front, behind, left, right, below, and above the monitor that contains NO wires, NO electronics, NO gadgets, NO wires-for-other-things. The only wires should be the video cable and the power cable. And maybe your wired keyboard/mouse. And any antennas, move as much of them to opposite side of room (e.g. routers).
Test that. Let me know if the glitching reduces or disappears.
I've seen radiofrequency-interference (RFI) glitching in monitors before. The most famous case is the
LG 5K monitor glitching with a nearby router (
"Keep your monitor at least seven feet away from your router"), but I've seen glitching in a GSYNC monitor caused by a poorly-shielded big-ass 200-watt power brick sitting UNDER the monitor. It's amazing how magnetic fields can inject glitches into nearby cheaply-shielded electronics.
Also get a ground-fault tester (under $20) -- a bad ground can also cause lots of glitching in a computer system that is hard to trace. Those are cheap at Home Depot, Amazon, and eBay. Wiring faults in home wiring can generate massive noise that sometimes wreaks havoc in electronics in weird ways -- whether strange static in a speaker or glitching in a display or sudden surge of BSODs, etc. Missing ground, crossed wires, etc.
It may still be coincidental defects, or firmware bug, but seeing this happen to two samples is quite unusual.
So it's prudent to at least quickly rule-out possible interference issues.
Rare as they are, they happened often enough to others for me to warn about this...
