The Fortnite calculations for Scoping/Ads/Targeting do not seem to be correct. If I enter my actual ingame value 0.501 for scoping, I get a target value that is absurdly high ~88 
If, on the other hand, I move my actual value one decimal place to the left (0.0501), I get a value that could be correct. ~40
Possibly the error lies between hip fire and any scoping methods.
Because the Fortnite hip fire value is 0,0XXX and any scope/Ads values are 0,XXX

I may be doing something wrong, but maybe it helps. 

 

You are probably not entering the values in the correct places. See the output for what value to enter into each box. For targeting you need to enter your Mouse Sensitivity X (Sensitivity 1) and Mouse Targeting Sensitivity (Multiplier 1) exactly like you have them configured. It seems like you have only entered your targeting sensitivity into the mouse sensitivity box.