Sub Objects glitch?

So I have pretty much all the achievements for HW2, yet my service record is not up to date/bugged. The Sub objective counter is stuck at 99%, which is a totally different number when you look at my stats by mission. This isn’t a game breaking bug just thought it needed fixing.

I too am curious about this. I’m sure it is only an error but it is still amusing none the less. The small details that slip by.