Shadow glitch when taking High Resolution Screenshot.

Hi, I am having this weird issue where I when taking a hi resolution screenshot it dithers my shadows about 70% of the time which basically cripples my workflow as I need to take over 300 shots in the engine.

Notes of things I have enabled:

I am using no precomputed lighting
I am using the experimental dynamic indirect lighting
I am using all moveable lights

Things I’ve tried:
Swapping engine versions from 4.16-4.15
Disabling dynamic indirect lighting (maybe makes it glitch out only 50% of the time)
Disabling AO
Changing lights to static/stationary
Using hi resolution screenshot in editor, in standalone and using the direct resolution i want 7680x4320 as well as x3-5 multiplier
I’ve used ansel for my screenshots and it works fine accept it disables my post processing volume when ever i use it.

Helps would be much appreciated as I’ve been struggling to fix this for a week at least now.

http://i.imgur.com/0zYKLsp.png