Electric field crossing a dielectric mismatch

[hassene85]

Hi,
I was doing a simulation on Piezoelectric fiber composite made of PZT fiber and epoxy in ABAQUS. The electric field in these composites is parallel to the interface plane (the electrodes are surface electrodes). I noticed that when the electric field is applied on the surface of epoxy it can not cross easily to the PZT but at the inverse case it is very easy.
I don't understand I am getting a difference between both cases. the electric field is crossing the same dielectric mismatch.
I am uploading two pictures for both cases for the potential contours obtained.
(The electrodes are on the top surface )
rod is made of two layers one is pzt the other epoxy
1st case epoxy upper side where the electrodes
2nd case PZT upper side where the electrodes.

Thanks