To reproduce:
1) Open attached project and scene
2) Make sure you have both Scene and Game views visible and separated (i.e. they are not using the same window tabbed).
3) Select Cube in hierarchy
4) Lock the inspector (so you could follow the values in "Test" component)
5) Play the scene
6) Drag the camera towards and outwards the cube

Expected: The Distance Band changes at 10 distance from both ends. (nearestDistanceFromSphere is 10)
Actual: It roughly takes about 11.2 for the Distance Band to change

Reproduced in 2017.1.0f3, 2017.3.0b6, 2018.1.0a3