The pec has two major parts
Most of the pec is the sternal head, named so because it attached along the length of the sternum.
The other part is the clavicular head, which attaches at the clavicle.
They have slightly different insertion points, and incline presses will deactivate the sternal head while still stressing the clavicular.
However flat bench, dips, etc usually activate all of the chest at once.
So my advice to distortion is try cutting bodyfat. Some guys store fat at the lower pecs that can mess up the lines. Other than that, it's just bad luck. Sorry man.