Question Inconsistent Monitor Burn

[PvtJet]

I work from home using a 3 monitor setup. Essentially for the monitors, I have two cables running from each, one to my desktop, one to my work laptop dock. At the end of the day I just switch monitor inputs and press my USB switch to swap my mouse and keyboard over, and boom, laptop to desktop complete.

However, I recently got a new work laptop with a new dock. And I quickly noticed something. 2 of my monitors are identical Dells that use HDMI to the work laptop, and a DP cable to my desktop.

Both monitors on DP? All good. Left monitor on HDMI? Good. Right monitor on HDMI? Now gets burn-in of spreadsheets throughout the day, so I often use the LCD conditioning on it when I switch to DP for personal use at night to clear it before

So why is one of my identical monitors getting burn in ever since I got a new laptop? What are my possible variables? Is it the HDMI cord? The monitor itself? The laptop dock? The new laptop software? Any ideas?

 

[Ralston18]

Update your post to include full system hardware specs and OS information for desktop and laptop.

Monitors: Make and model for all three monitors? Dell noted for two of the monitors.

Methodically swap cables, then monitors about in order to determine if the burn-in definitely follows the monitor, follows the cable, or stays with laptop connection.