Thank you for the response,
Did a Run only generating for the Tamriel world spaces when able (as a quick test) and the issue vanished. There's a bit of a line but I don't really care, anything is better than the weird light show.
I am using Community Shaders. The glow also has a eye adaption effect that grows stronger the longer I look at it. I did use KreatE to remove and or adjust the effect and it didn't help, everything has eye adaption removed, but not the effect. Did another generation with all world spaces and its gone still?? While I am very confused I'm happy it resolved itself but am worried it will come back... I'll definitely keep an eye out while I play...
Should the issue stay gone it was probably something I did during generation, which is weird because I didn't change any settings. Probably the Resources not being loaded at some point??