Weird DisplayPort Behavior with Wacom Tablet... Curious

[hihihi8]

Hmm.. So I've got a triple monitor setup that I drive using the 3 displayports on my 980ti. Recently I got a Wacom Cintiq Pro 16 pen display tablet, and since I don't have thunderbolt 3 on my workstation, I use it by unplugging one of the DP monitors when I'm using it. The weird part is that the Wacom tablet only works properly if i plug it into the DP port closest to the PCIE Slot. Anywhere else and it starts exhibiting the following:

 

1. Random disconnects and reconnects (along with the windows USB connect/disconnect sound FX)

2. Terrible image retention/temporary burn-ins near the edges of the screen

3. Horizontal thin white bars that race down the right hand side of the screen

4. General display artifacts and color inaccuracies where the edges of the screen

5. large areas of flickering backlight occassionally

6. Increased backlight bleed

 

The symptoms get worse and worse the farther the DP port I use is from the PCIE Slot. (i.e. plugging into the port closest to the SLI bridge makes the problems the worst, the middle one makes it a little better, and the one closest to the PCIE slot is pretty much free of issues). I am very curious why this would happen. AFAIK, all 3 DP ports are "known-good," as I use them regularly. I essentially swapped ports with one of my monitors to "solve" the issue.

 

Any ideas why this would happen? I'm in the process of RMA'ing the tablet to see if anything changes...some videos here: https://drive.google.com/open?id=1-BceIbsnMZKnklNRgziPALtyWShRtbQ2