1.5 scope wont increase sensitivity

I have the 1.5 scope maxed out at 2 sensitivity while all my other scopes are around .3-.5 and it feels much slower. I could increase 'ads' sensitivity but i cant lower the other scopes much more.

Is the sensitivity supposed to be that much different? It felt fine before, but I haven't played in a few weeks.

See? I have the same problem! What happen to the sens's?