ahokoji

Are you sure it's set to 1.7? Apex will reset it to 1.55 if you do any changes in the settings, and the game maxes out at around 1.64 anyway, you won't actually get 1.7.
This is correct, Apex with ADS multiplier 1 will scale all scopes using MDV 0%. Rainbow six will scale all scopes using MDV 0% when they are set to 50. So the games use the same base scaling, but different number. But this means that you will get the same sensitivity value for all scopes if you use MDV 0%, this is just showing the calculator doing it correctly. In your case it should be like this if the fovscale is 1.55:
https://www.mouse-sensitivity.com/?share=9e9a3ddd6b4402ea1e987c806a57f596
The scale for ADS and Scope is adjusted slightly to 99.0827% to account for a rounding but in Apex (the bug is in the game, not the calculator).