Walter!
Oh I am sorry – I didn’t explain properly.
So here’s the deal, the image below is what it looks like without the ADD blend mode.

If I ADD the blend mode, it looks like this, it also looks PERFECT when I watch it on the VLC Player (This is what I want in my end result).

Once I Render it and import in After Effects, OR if I add a ADJUSTMENT LAYER on top of everything with the ‘Clip To Output White ON’ (with ADD BLEND MODE on the HEXAGON GLOWING LAYER), it looks like this :

My Timeline in case it’s helpful below:

I changed it’s structure from 4 Layers in ADD in top of each other for the hexagon to just one, with a very bright glow FX on it instead, because I thought that the 4 layers in add in top of each other could be causing issues, but in the end I got the same results with both.
Project is on 32bpc, I rendered it using Animation Codec, RGB +Alpha as you can see both images below:


Let me know if I was clear enough!