Mode 1 contours

Could anyone tell me why in abaqus,while running a 3D
mode 1 fracture analysis,I am not getting the same type of contours on
either end of the thickness,i.e.i mean, front and back??While in front
side i am getting all the symmetric contour plots,including the red part
which shows the highest in the legend,while the back side is devoid of
it