About the bands left after correction

I have processed sen2cor correction for 10m resolution and 20m resolution.But in the 10m resolution image after correction,there are only b5,b6,b7,b8,b8a,b11,b12 bands left,and in the 20m resolution image, there are some bands lost as well.So,my question is that the situation is normal or not?
And how can I judge that the atmosphere correction is right or not?