I had the same issue playing BF6 Beta. 8 believe it was caused by intense colours correction on certain maps, especially on Liberation peak. This bluish colour filter is too intense so it makes the picture look dull, lifeless and cheap there. This colour correction includes increased contrast value as well which makes the bright scenes look too bright, while the darker scenes look too dark, so it causes eye fatigue. It makes the textures look less detailed and make the enemies harder to spot. The other two maps in BF6 Beta had less intense colour filter, so they looked more natural and didn't cause eye fatigue. So I believe colour correction should be completely reworked for Liberation Peak and Empire State (and any other map which has the similar colour filter) to make it less dull and fatiguing, while looking more natural instead.
