Not sure if this is a bug (seems like it). However i cannot game at anything below 100 FOV (motion sickness), so i changed it within the configs to 110 i find this most comfortable now when i enter the power armour, the overlay it gives has 2 rather large areas on the left and right side of the screen, nothing is wrong, i can see the world completely fine with them just the overlay itself seems to not "stretch" to the edges of the screen as one would think it would.

aspect ratio

What do you mean by that? i play in 16:9, if that's what you're asking