I wanted to throw some troubleshooting steps with the problem I've been having out there and see if anyone has some thoughts or advice.
To state the problem plainly, the screen my new circuit sword kit seems to have strange lines that extend to the edge of the screen. These are not static lines, because they follow graphics as they move around the screen. When I connect an HDMI to the board, the output is totally fine.
Here is an example of the issue I am seeing:
Here has been my troubleshooting adventure so far:
1. I've reseated the cable many times thinking that was the most likely cause. Cable itself seems fine. Issue does not improve or change.
2. Playing with Config.txt. I've played with some of the overscan settings. I don't really know what I'm doing here but spent a while with trial and error. No change or improvement (assuming my change didn't cause the screen to not work at all).
3. Starting fresh with an image on the SD card. Image is the "retropie-4.4-rpi2_rpi3-wifi_CSO_CM3_20180603-154410.zip" from Kite's GitHub page. No change.
4. Reseated RasPi module. No change.
5. Who wears short shorts? Maybe the screen case is shorting on something? I booted with the screen not touching any part of the board. For most of the testing I've had the front part of the case. It improves, but the issue is still there. I'd take a pic but I don't have enough hands.

So, is there something I'm missing (not using the right software, config settings that are known to work with this screen, etc etc)? Or is this perhaps a bum / damages screen? I have some other screens from another build that I may be able to connect just to see if it's not a screen issue at all.
Musings, thoughts, criticisms all welcome. Thanks in advance!