This isn't an error; this is just how ENB post processing behaves. It doesn't play nicely with AA, AF, and other graphics functions, as AnnihilatingDespair says.
It's one of the reasons I stopped using ENB in favor of just using good lighting and weather mods. The game can look quite good even without more modern effects, if you find mods that complement each other well.
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It's one of the reasons I stopped using ENB in favor of just using good lighting and weather mods. The game can look quite good even without more modern effects, if you find mods that complement each other well.