Everything is matched to the FOV of your input, i.e. CS GO hipfire. For the scopes to be 1 they have to be matched to the same FOV as the input, so if you set BFV FOV to 73.74 they will be 1 as expected.
That's the drawback of using anything other than 360 distance for hipfire, you get huge differences in speed when the FOV is different. ROE and PUBG are pretty close in FOV so it doesn't affect it as much. Try to switch hipfire to 360 distance and it should feel better.